KEUFFEL & ESSER, New York / USA     » DORIC 10000 «      (1950)
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                                    Copyright by  ECCO CO. 1946

S C A L E S   of  the   P O C K E T     Model   » DORIC 10000 «
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Front Side            [ inverse / RED ]               Back Side
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K        X3 
A        X2                                    DF         πX
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B        X2                                    CF         πX
ST       arc(0.01X)                            [CI]       [1/X]
S        sin(0.1X)                             C          X 
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D        X                                     D          X
T        tan(0.1X)                             L          lgX


R E M A R K S :                      (  1° = 60' ;   1' = 60" )
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The  TRIGONOMETRIC  SCALES  are divided  in  MINUTES  & SECONDS

This  Plastic  Pocket-SR  came with a  brown leather case  in a
green  K+E  Cardboard Box.  There is no  »K+E«  on the SR,  but
 (1st) the label on the box says "DORIC K+E 10000"
 (2nd) the "10000" is on the SR's slider
 (3rd) one cursor glass was broken and could be replaced
       with an original K+E ( # 682188 ) window

Later the  POCKET  K & E   Model 681555  »DORIC«  was found ...
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                                                    SN = 034364

The SAME SCALES, but the CI-Scale is  BLACK-reverse-italic. The
Pocket-SR came in a green  K & E leather case with a clip.

                            Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann     09/10/11