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NESTLER   » PRAEZISION «
( 25 cm with 50 cm Scales W1/W1' & W2/W2' )



Albert Nestler, Lahr in Baden / Germany                    (1950)
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S C A L E S   of  the   N E S T L E R   »PRAEZISION«   Model 0270
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Front Side            [ inverse / RED ]                 Back Side
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( 0 ...  27 cm Ruler )

L      lg( W1 = sqrt(X) ) ; lg( W2 = sqrt(10X) )
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D      X
W1     sqrt(X)
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W1'    sqrt(X)                  SIN  6° .. 18°  ===read===>>  W1'
[W2']  [ sqrt(10X) ]            SIN 19° .. 80°  ===read===>>  W2'
[W1']  [ sqrt(X) ]              TAN  6° .. 17°  ===read===>>  W1'
W2'    sqrt(10X)                TAN 18° .. 45°  ===read===>>  W2'
-----------------------------------------------------------------
W2     sqrt(10X)
SIN    2° .. 5° 40'  ==read==>>  W2
-----------------------------------------------------------------
K1     W13
K2     W23

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

Because the scales W1/W1' start at 1 and end at sqrt(10)
    and the scales W2/W2' start at sqrt(10) and end at 10
the 25 cm NESTLER has the "PRECISION" of a 50 cm slide rule !!!

This historic mahogany model has a table with physical constants
on its back side and a blind print "28" ?  It came without case.

Historical Remarks ...

Compare the SCALE DESIGN with
    the »NESTLER-27«,
    the »WICHMANN-1417« ( made by A.N. = Albert Nestler),
    the FABER-CASTELL »COLUMBUS/A.Rohrberg« and
    the "modern" FABER-CASTELL »NOVO-DUPLEX«

impressum:
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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   09/19/12