KOLESCH & Co. NewYork / USA                                (1920)
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              made by (?) Albert Nestler, Lahr in Baden / Germany

S C A L E S     o f    t h e     K O L E S C H            Simplex
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( 0 ...  25 cm Ruler )

  A      X2
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  B      X2                        S      sin(0.01X); sin(0.1X)
   ( 11_1/2 ... 20_1/2" Ruler )    L      lgX
  C      X                         T      tan(0.1X)
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  D      X

( 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

S keyed to A/B ;  T keyed to C/D

The SR is made of mahogany with scales on celluloid veneer. Under
the slider is a continuous RULER on the body. On the back side of
the slide rule is a TABLE with TECHNICAL CONSTANTS & CONVERSIONS.

Inside the body, the PRINT "D.R.G.M.164885" ref. to NESTLER: 1910
NESTLER  got  the  "Deutsches-Reich-Gebrauchs-Muster"  for  using
screws to secure the laminated celluloid scales on the body.

The CURSOR has 2 HAIRLINES - but not in Radius/Area Relations ???
( ?  because TABLE in ENGLISH  =???=  1 ft/sec = 1.0973 km/h  ? )

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