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Monroe Calculating Machine Company

The Monroe Calculating Machine Company was a maker of adding machines and calculators founded in 1912 by Jay R. Monroe and Frank Stephen Baldwin based on a machine designed by Frank Stephen Baldwin.



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Book 1 of 6 of a service training manual for the Monroe Calculating Machine Company. The envelope of product photos referred to at the end of the book is not present. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Instruction manual for the Monroe D through G model mechanical calculator.
Topics: calculator, monroe calculating machine, mechanical calculator, monroe
Monroe Machine Service Bulletin No. 420-A, describing the functions of, and how to disassemble, reassemble and lubricate, the L-160-X and L-200-X models of mechanical calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
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Instruction booklet for the Monroe LA series electromechanical calculators.
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Monroe Calculating Machine Company
by George C. Chase, I. Bernard Cohen
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Article containing the text and slides of a slideshow given in May 1952 by George C. Chase, director of research at the Monroe Calculating Machine Company starting in 1917, about five years after the company started. The slides contains a overview of various mechanical calculators.
Topics: calculator, mechanical calculator, monroe calculating machine, monroe
Book 2 of 6 of a service training manual for the Monroe Calculating Machine Company. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 34, an illustrated service manual for the K0 and KA0 model mechanical calculators, including drawings of all tools required. In preparing this manual, the engineers completely disassembled, reassembled, and adjusted a K0 and KA0 16-place machine, documenting each step along the way. MSB 34-A, dated 15 June 1926, is included in this copy. It is a one-page bulletin intended to go with plate 22, giving a sequence of selecting gears which helped to standardize...
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 116, an illustrated guide to disassembling, assembling, and adjusting the MA-213 model mechanical calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Co., Inc.
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Instruction book for the Monroe MA series of electromechanical calculators. Also known as Form 878-S.
Topics: Calculator, Instructions, Monroe
Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Calculations and instructions for use with the obsolete Monroe electromechanical calculators, specifically, the model 8N.
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Monroe Calculating Machine Company
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Instruction book for the Monroe KA series of electromechanical calculator. Also known as Form 660 S. Originally printed 1928, this copy is a reprint edition from 1943.
Topics: Calculator, Instructions, Monroe
Monroe Calculating Machine Company
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The Monroe Calculating Machine (Office Machine Practice series) By Chester H. Katenkamp The Gregg Publishing Company 1931 58 page stapled book 142mm × 204mm
Topics: Mechanical calculator, Monroe, Instruction manual
Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 95C, the illustrated parts and assemblies price list for the L model of mechanical calculator. The models covered are: L 1207 L 160 and L 200 LA 160 and LA 200 L 160-X and L 200-X LA 160-X and LA 200-X This MSB obsoleted and superseded MSB95 and MSB95A, and so ordered that they be destroyed. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Publication B-182, a guide for teaching the use of Monroe mechanical calculators using the Monroe Educator model of calculator. This copy is the 18th printing (June 1961) of the original 1947 document.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Book 6 of 6 of a service training manual for the Monroe Calculating Machine Company. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
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Monroe publication 1045-S, instruction manual for the LN model of mechanical calculator. This is the September 1958 printing of the manual.
( 1 reviews )
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Contract No. GS-00S-15300, the 1958 price list for the United States Government. Describes and depicts all the models of Monroe calculator available to the government in 1958, along with prices, discounts for volume, and prices for rental and maintenance. Found on Ed Thelen's site (ed-thelen.org), this document was originally obtained from LaFarr Stuart, who obtained it from a Monroe salesman.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 40, describing the mechanism, disassembly and reassembly of the K models 1AA and 2AA of mechanical calculator. Note that there is a parts list of 9 pages referenced in the cover letter. The subsequent MSB 40E-prime contained an updated parts list, and specified that the parts list in this MSB be destroyed, and so those pages no longer exist in this MSB. Note that MSB 40E-prime is not the same as MSB 40E. There were actually two MSB's published under number...
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 516, cataloging all parts used in gN-162 and 6N-212 models of mechanical calculator, with part numbers and prices. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 161 Supplement C, the fourth installment describing the functioning and adjustment of the LA-6 model mechanical calculator. Other supplements contain further description. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe publication B-102, an office practice course using the Monroe LN Educator mechanical calculator. This copy is the 26th printing, Dec 1961.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Form MO-96, a programming manual for the Monrobot XI general purpose computer. A general overview about this computer can be found on Wikipedia . This is the January 1964 edition.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Publication B-154, covering basic algebra, and how to rearrange formulas for efficient calculation on a Monroe mechanical calculator.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe publication 1231-S, an instruction manual for the LA-9 mechanical calculator.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Service manual for the Monroe Calculating Machine Company's obsolete data/log printer, model MC 10-40. The MC 10-40 was a 16 columns electromechanical printer printing on a continuous paper strip. The characters it could print were digits 0-9, A, B, -, +, and a dot.
Topics: printer, schematics
Monroe Calculating Machine Company
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Book 4 of 6 of a service training manual for the Monroe Calculating Machine Company. Download the file to see the foldouts at the end -- the Archive's viewer doesn't seem to be able to handle different-sized pages very well. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe publication GS-713, instruction manual for the Simplex Electric Models 410-11-011 and 408-11-011 mechanical printing adding machines.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Form 769-S, how to compute square roots on a Monroe mechanical calculator.
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Monroe Form 1038-S, describing how to perform statistical calculations such as means, standard deviations, linear correlations on the general CAA-10 electromechanical calculator and on the statistics-oriented CAA-10-3-S.
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Monroe Calculating Machine Company
by Monroe International
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The second edition of the 1965 Orangeaid published by Monroe International, a division of Litton Industries. Contains some information about Monroe's calculators, but mostly feel-good quotes and letters, including an amusing warning about THE COMMUNISM!
Topics: monroe calculating machine, calculator, orangeaid, litton industries
Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 445, an outline for teaching Monroe servicemen about the L, LA, LA-5 and LA-6 models of mechanical calculator. Details the order the models are presented in, the machine service bulletins that should be studied, and practice tasks. Missing pages 4 and 5. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 36, 36A and 36B, covering details about AC and DC motors used in the K models of mechanical calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Notes made by one M. H. Hitchcox on Monroe Service Bulletin 440-D pages 102 through 113, with a two-page annex not included in the MSB consisting of points to check in setting up CAA-10s.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Pages 3 and 4 of a Monroe Calculating Machine Company newsletter from May 1971. Page 4 in particular describes the history of the L model mechanical calculator, from 1929 to 1971.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 101, describing how to install and dismantle motors on the LA models of mechanical calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 40B, containing plates 47 - 51 as an addition to MSB40, showing the symptoms when various springs in the K 1AA and 2AA models of mechanical calculator are unhooked. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 45, complaining that KAA models of mechanical calculator were being sent to the main branch improperly packed resulting in broken pieces and machines in "deplorable condition". Also, some machines were being sent without the identification form 27-M. Contains instructions on how to pack the machines properly for shipment. This bulletin is unique in the amount of exasperation, sarcasm, and exhortation displayed. This copy was scanned from a set of...
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 181, describing some new pawls and cams for the LA-6 model mechanical calculator that can be installed if the old parts should fail to work even after adjustment. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Publication 1191-S, on how to extract square roots, cube roots, and higher roots, with tables for up to 10th roots. 
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Monroe Calculating Machine Company
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Advertisements from Railway Age Gazette, June 22, 1917. Pages 25 and 26.
Topics: Monroe Calculating Machine Co, Nicholson File Company
Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 440-D, a detailed description of the function, testing, adjustment, lubrication, and parts of the Monroe Calculating Machine Company's Monromatic CAA-10 calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 178, describing some adjustments for specific problems. This is a June 1945 reprint of the original 1934 document. Based on comparisons of other reprints, this document was most likely generated from the original mimeograph masters with the exception of a small reprint notice. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 238, describing an issue with the registering dials on LA-6-W and LA-6-C model mechanical calculators which can be solved with changed parts. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 270, describing a change made to all LA model mechanical calculators except the LA-6 and all MA models except 2-carriage models, to eliminate noise during repetitive cycles and to prevent the machine from stopping off-center. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 429, describing a revision in the design of the plus and minus key mechanism in LA, LA-5 and LA-6 models of mechanical calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 376, describing a change from fibre washers to "dry" type washers in LA and MA model mechanical calculators to prevent uneven carriage shifts. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 161 Supplement B, the third installment describing the functioning and adjustment of the LA-6 model mechanical calculator. Other supplements contained more description. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Publication B-251, a better way to teach arithmetic with the Monroe Educator Calculating Machine.
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Monroe Calculating Machine Company
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Advertisements from Railway Age, June 14, 1920. Pages 39 and 40.
Topics: Monroe Calculating Machine, L C Chase & Co, The American Automatic Connector Co, Mohawk...
Photo, February 1946, of the Monroe Calculating Machine Company factory on Boylston and Exeter in Boston, Massachusetts. Taken standing on the east side of Exeter street facing north. Also contains Huntt's Cafeteria on the ground floor and the Exeter Street Theatre.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 257, describing an adjustment for satisfactory shift of the carriage on LA-5 and LA-6 model mechanical calculators, after all other adjustments have been exhausted. This copy appears to be a reprint of an original document which, based on MSB numbering and dates, would have been originally published between 30 December 1935 and 26 June 1936. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating...
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Advertisements from The World's Work, Advertiser section, possibly 1919.
Topics: Monroe Calculating Machine, Hammond Typewriter, The Edwards Mfg Co, Dickson School of Memory,...
Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 193, describing some adjustments for specific problems. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 93, describing how to adjust the speed of 115 volt and 230 volt universal motors used in Monroe mechanical calculators. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 40E, containing a parts a price list for full automatic and 3-series model K machines. This list was intended to obsolete the list originally provided in MSB40 and MSB48. Note that there is a second MSB 40E that was published 18 months earlier. I have called that document MSB 40E. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 422, describing the inspection, disassembly, cleaning, reassembly, lubrication and testing of all Monroe mechanical calculator models using small motors. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 221, describing changes made in L and M model mechanical calculators to solve various issues. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Advertisements in The World's Work (Advertiser section), 1919. Unsure which volume or issue, but probably volume 38. Contains ads for the Monroe Calculating Machine, the Venus Everpointed Pencil by American Lead Pencil Co, and Durand Steel Racks by Durand Steel Locker Co.
Topics: Monroe Calculating Machine, American Lead Pencil, Durand Steel Locker
Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 100-A, showing voltage and frequency specs for various motors used on the LA models of mechanical calculator, and specifying condenser and resistor values. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 161, the first installment describing the functioning and adjustment of the LA-6 model mechanical calculator. Subsequent supplements continued the description. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 415, describing the shift mechanism in the LA-5 and LA-6 model mechanical calculators. This document was incomplete: it mentions a large drawing which was not included. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 40A, containing plate 35A for insertion between plates 35 and 36 of MSB 40. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Form 1228-S, a double-sided card on how to extract square roots, with a table of factors.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Publication B-243, about a study performed by Dr Howard F Fehr on whether the use of calculators in the classroom made students enjoy arithmetic more.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 177, describing the functioning and retrofitting to the LA-5 and LA-6 model mechanical calculators of an improved division lever return mechanism. The company wanted all existing and new LA-6 calculators to be retrofitted with this modification. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 116-A, supplementing plate #12 in MSB 116. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 161 Supplement D, the fifth installment describing the functioning and adjustment of the LA-6 model mechanical calculator. Other supplements contain further description. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
Topics: calculator, mechanical calculator, monroe calculating machine, monroe
Press photo, October 3, 1945, at the Monroe Calculating Machine Company in Newark, New Jersey.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 24, illustrating the assembly and adjustment of K series "1" and "2" mechanical calculators. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 244, describing a change to the through-carry unit and automatic multiplication mechanism of the LA-6-200-C mechanical calculator. The change was not to be retrofitted to existing models. This copy is a reprint from February 1946 of the original 1935 document, but without color. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 215, describing how registering and counting dial shafts on L-model mechanical calculators will be stamped based on their alignments. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Press photo, September 9, 1930 at the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 244, describing a change to the through-carry unit and automatic multiplication mechanism of the LA-6-200-C mechanical calculator. The change was not to be retrofitted to existing models. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 36C, describing installation of a new start and stop switch for the K models 1A, 2A, 1AA, and 2AA (but not 0A) of mechanical calculator. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
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Monroe Calculating Machine Company
by Monroe Calculating Machine Company
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Monroe Machine Service Bulletin No. 288, describing the retrofit of a locator arm mechanism on the LA, LA-5 and LA-6 models of mechanical calculator for prevention of stopping off-center. This copy was scanned from a set of documents originally kept at the Toledo, Ohio branch of the Monroe Calculating Machine Company.
Topics: calculator, mechanical calculator, monroe calculating machine, monroe