Charles Bruning Co.  /  USA                                (1944)
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S C A L E S   of   the      »  P O C K E T  «          Model 2401
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Front Side             [ inverse / RED ]                Back Side
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0 ... 12.5 cm Ruler
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A        X2
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B        X2                           S     sin(0.01X); sin(0.1X)
[CI]     [1/X]                        L     lgX
C        X                            T     tan(0.1X)
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D        X
K        X3
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5" ... 0 Ruler

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

S keyed to B ;   T keyed to C/D

The SR is made of plastic.  The back side has  3 SCREWS to adjust
the SLIDER's FRICTION. The SR came in a BLUE BOX with INSTRUCTION
BOOKLET and in a BROWN LEATHER CASE.

                      Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann       07/16/14