A.W.Faber-Castell, Stein bei Nuernberg / Germany      (1973)
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                                                 VERSION (C)

S C A L E S  of the  FABER-CASTELL   » RIETZ «   Model 57/87
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Front Side         [ inverse / RED ]               Back Side
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( 0 ...  27 cm Ruler )

K        X3
A        X2
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B        X2                   S      sin(0.1X) ; [cos(0.1X)]
[CI]     [1/X]                ST     arc(0.01X)
C        X                    T      tan(0.1X) ; [cot(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

There are 3 Model 57/87 in the Collection:

Newer Version (C)
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Production Code = 573 = May 1973

has a blank inner body.  The cursor's spring is removable
( cleaning! ) and has BLACK MARKS (q, kW, PS / kW, d, PS).
It came in a green/beige plastic case with a booklet.

Older Version (A)
Production Code = 4 66 = April 1966

is named  » RIETZ SCHUL-RECHENSTAB «  in the inner body.
Its cursor has RED MARKS (q, kW, PS / kW, d, PS) and a
fixed spring.  It came in an acrylic case.

Newer Version (B)        NOT SHOWN
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Production Code = 1170 = Nov. 1970

This slide rule has the same scales and model number as
Version (A) - But it is named  »RIETZ«  only.  Its cursor
has BLACK MARKS (q, kW, PS / kW, d, PS).  It came in a
GREY plastic case with a booklet.

                   Historical Remarks ...
impressum:
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© C.HAMANN    http://public.BHT-Berlin.de/hamann    09/30/07