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DENNERT & PAPE   ( ARISTO )
MANNHEIM   POCKET   ( 12.5 cm Scales )



( ARISTO-Werke )  Dennert & Pape, Hamburg / Germany  (1929)
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                                                VERSION (A)

S C A L E S  of  the   DENNERT & PAPE    MANNHEIM    POCKET
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Front Side                                        Back Side
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                                     ( 0 ...  13 cm Ruler )
A       X2
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B       X2                    S       sin(0.01X); sin(0.1X)
                              L       lgX
C       X                     T       tan(0.1X)
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D       X
                                         ( 0 ... 5" 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

VERSION (A)
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This old model is made of mahogany with scales on celluloid
veneer. For the manufacturer the engravements in the bottom
»D&P«  and  »29«  could be interpreted as  "Dennert & Pape"
and "1929".  Ref. to the print on the back side and on its
leather cover, this old  Pocket Slide Rule  was a gift from
the constructor company  » WAYSS & FREYTAG A.-G., DRESDEN «
well known for their engagement in reinforced concrete.
 
Because the original cursor was missing, there is a home-
made of aluminum with a window of PVC from a CD case.  The
hairline is made with a »X-ACTO« and colored with a marker.

Historical Remarks ...

VERSION (B)
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There is NO Year Code - The engravement in the bottom reads
» DENNERT & PAPE ALTONA «  The CURSOR has a print »PERTODO«
May be the Pocket SR was a gift from this company ?

The picture from the side shows construction details: The
mahogany strips are glued on the celluloid base - and the
glass of a "Frameless Cursor" has grooves for the clips ...

 

        ... The SCALES got EXTENTIONS in RED right and left
             and have lost the historical "Ladder" pattern.

impressum:
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http://public.beuth-hochschule.de/~hamann          06/17/10