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ACU-MATH   1200   ( 5" / 12.5 cm Scales )





ACU-RULE MFG. CO., Mt.Olive. Illinois / USA              (1965)
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SCALES  of the   ACU-MATH   P O C K E T   MANNHEIM   Model 1200
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Front Side                                            Back Side
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K       X3
A       X2
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B       X2                         S      sin(0.01X); sin(0.1X)
CI      1/X
C       X                          T      tan(0.1X)
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D       X
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(")

S keyed to A/B  ;   T keyed to C/D                    QUESTION:
                                                      *********
The 3 CURSOR HAIRLINES do not match  "Area/Diameter"  Relations
as usual. When the center hairline is set on ( C-Scale ) 2, the
left hairline is on  1.72  and  NOT ON  sqrt( π ) = 1.77  =???=
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The SR came in a worn brown leather case.

                      Historical Remarks ...
impressum:
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© C.HAMANN  http://public.beuth-hochschule.de/~hamann  01/01/10