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Report 856 

JAPANESE DRAFTING EQUIPMENT 
Project GNS 468 
8 July 1944 


Submitted to 


THE ENGINEER BOARD 
Fort Belroir, Virginia 


The Chief of Engineers 
U. S. Army 
Washington, D. C. 
FOR OFFICIAL ACTION 


J. C. Cosby 

Warrant Officer, U. S. Army 
Fort Belvoir, Virginia 


This document contains information affecting the 
national defense of the Uhited States within the mean¬ 
ing of the Espionage Aot, 50 U. S. C., 31 and 32, as 
amended. Its transmission or the revelation of its 
oontente in any manner to an unauthorized person is 
prohibited by law. 



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Section 


II 


III 


IV 


Title 

DESCRIPTION OP TIB ITEM 

I, General 
TECHNICAL FEATURES 

Z, Description 

USE OF THE ITEMS OF EQUIPMENT 

3* Length of Service 
4# Uae 

COMPARISON WITH AMERICAN EQUIPMENT 

5# General 
6« Aeouraoy 
7# Compactness 
8* Weight 
9# Design 
10* Operation 

II, Material 

RECOMMENDATIONS 

12* Recommendation. 


1 

l 

l 

l 

l 

l 

l 

l 


7 

7 


Appendix 

A DEDUCTIONS AS TO JAPANESE ECONOMIC STATUS, 

AND NAMEPLATES AND MARKINGS 


iii- 


•4<4NNMNM 


JAPANESE DRAFTING 


I. DESCRIPTION OF THE ITEM 

1. General , This report covers a captured Japanese drafting 
or plotting set consisting of the following itenet a set of draw* 
lng instruments with oase, slide rule, with case, plastic protractor, 
plastio straight edge or bean for bean eompass, wood triangle, and 
a combination deflection fan and ooordinate scale, (See Figure 1,) 
The set is provided with a canvas oarrying oase whioh was probably 
also used for oarrying maps as it is considerably larger than is 
required for oarrying the above-named items. The slide rule was 
made by Henani, Japan, but the other items have no trade marks or 
manufacturers' nameplates. The equipment was captured in the South 
Paoifio area. The date of oapture is not known. 


II. TECHNICAL FEATURES 

2, Description , The drafting set oansiBts of oonventian&l 
commercial items which, with the exoeptian of the combination de¬ 
flection fan and ooordinate soale,. are equal to similar items manu¬ 
factured for madium-prioe sale in the Uhitsd States, The combina¬ 
tion deflection fan and ooordinate scale combines two Instruments 
into one (paragraph 9), The set of drawing instruments has several 
more pieoes than the field drawing sets issued to United States 
Army Chits. 


III. USE OF ITEM OF EQUIPMENT 

3, Length of Servioe . The equipment appears to have been 
used oonsicKrably, Its probable length of servioe is three to five 
years, 

4, Use , The set of equipment was probably used by the fire- 
control seotion of a field artillery unit for plotting firing data* 


IV, COMPARISON WITH AMERICAN EQUIPMENT 


5, General , No oomparable sets of American equipment are 
issued to tf, d* Army imitsj however, the component ports of the 
Japanese set have oomparable items in general use in various U, S, 
Army sets. 


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6* Aoouraoy * The protractor*, triangle and combination de- 
fleetion fan and coordinate aoale are equal in accuracy to similar 
items of U* S* equipment* The plastio beam for the beam oompass 
does not hare sufficient rigidity to afford aoouraoy equal to that 
of the wood beam used by U. S, Array wits for similar work* 

7* Compactness * Comparative sixes of U* S* and Japanese 
drawing instrument sets and slide rules of similar types are shown 


below* 






Instrument Set 


TJ. S* 


Japanese 


Overall size of oase 

M 

to 

4 6/8 x 

10 1/4 

1 x 6 1/4 x 9 i 

Lnohes 

Number of pieoes 


11 

inches 

20 


Slide Rule 


a 

• 

CO 

• 


Japanese 


Overall size of oase 

7/8 x 

1 7/8 x 

11 inohes 

1 5/16 x 1 3/4 

x 11 1/4 





inohes 


Overall size of rule 

3/8 x 

1 3/8 x 

10 5/8 

13/32 x 1 6/16 

x 11 



inches 

inches 



8* Weight * Comparative weights of U* S* and Japanese items 
are shewn below* 


Instrument Set 

U. S. 

Japanese 

Total weight with oase 

13 os 

1 lb 2 oz 

Slide Rule 

U* S. 

Japanese 

Weight of case 

2 oz 

2 oz 

Weight of rule 

2& oz 

3 oz 

Total weight 

4$ oz 

5 oz 


9* Design * Since the Japanese set of equipment includes only 
conventional items* with the exception of the combination defleotion 
fan and coordinate soale, the design of the equipment is neoessarily 
the same as that of similar equipment produced in the liiited States* 
The defleotion fan differs somewhat in design from similar equipment 
used by the U* S* Army* The Japanese fan is laid out on a rectangu¬ 
lar piece of plastio* The two oorners on opposite sides of the 
vertex of the defleotion lines are utilized for coordinate soales* 
The deflection fan used by U* S* Army units is shaped generally like 
an elongated fan, with the oorners on opposite sides of the vertex 
of the defleotion lines out away* 

Army units is shaped like a small 
at right angles to each other* 


The coordinate scale used by U.S* 
carpenter's square, with two scales 


I 





FIG. 1. JAPANESE DRAFTING OR PLOTTING SET. View shows component parte of 
set. Manufacturer's nameplate (Hemrai) appears on slide rule. 




FIG. 2. JAPANESE INSCRIPTION ON THE CANVAS FIG. 3. JAPANESE INSCRIPTION ON THE DRAWING 

CARRYING CASE. INSTRUMENT CASE. 



10. Operation . Since the design of the various items of 
Japanese equipment is essentially the same as similar items of 
American equipment, the operation is generally the same. 

11* Material . The material used in manufacturing the 
Japanese equipment is the same as that used in comparable United 
States equipment, with the following exceptional 

3* The Japanese plastic beam for beam compass is not 
considered equal to wood beams used by U. S. Army units. 

The Japanese wood triangle is not considered as 
durable as American plastic triangles; the accuracy is the 
same. 


-2* The Japanese slide rule is made of bamboo wood 
while equivalent United States rules are made of hardwood, 
usually mahogany. Both seem equally satisfactory. 


V. RECOMMENDATIONS 

12. Recommendation - The Japanese combination deflection 
fan and coordinate scale is the only piece of drafting equipment 
differing from items in common use in the United States. This 
item of Japanese equipment has combined two U, S. items into one, 
but since rib particular advantage is gained by this combination, 
no action is recommended. 


Submitted by: 


-JLJL 


J. C. Cosby, 
’,7arr<fot Officer, U. S 
tapping Branch. 



Forwarded by: 



'Joe K. Fuller^ 

Major/ Corps of Engineers, 
Director, Technical Division I. 



TTilliam C. Cude, 
Major, Dorps of Engineers, 
Chief, Mapping Branch. 



■7. 




DEDUCTIONS AS TO JAPANESE BCOiOMIC STATUS 


AID 

NAMEPLATES AMD MARKHOS 


-9- 


DEDUCTIONS AS TO JAPANESE SCCKOdC STATTB 


No deductloos as to Japanese eoonomio status are possible 
from the examination of this equipatent. 


NAMEPLATES AND MARKINGS 


The manufacturer's nameplate (Hemmi) appears on the 
slide rule. The other items comprising the set are without 
nameplates. 

Japanese oharaoters appear on the oarrying ease (Figure 

2 ). 

Japanese oharaoters appear on the drawing instrument 
oase (Figure 3). 


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