DAMIEN, Paris / France                                     (1965)
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S C A L E S  of the  DAMIEN                   » UNIVERSAL RULER «
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Front Side                                              Back Side
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( 0 ...  27 cm Ruler )

K        X3
A        X2
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B        X2                                    S        sin(0.1X)
CI       1/X                                   ST      arc(0.01X)
C        X                                     T        tan(0.1X)
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D        X
L        lgX
                                         ( 0 ...  10_1/2" Ruler )

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

The SR is made of aluminum and bronce. It came in bad conditions:
Blocked & tortured on its ends. Back-Side has CONVERSION-TABLES. 

                       Historical Remarks ...
impressum:
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© C.HAMANN      http://public.BHT-Berlin.de/hamann       04/11/22