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"Universal SlideRule" (?) by Dr.-Ing. Eugen Moeller, Darmstadt
FABER-CASTELL   »MATHEMA«   MODEL   2/84
( 25 cm Length with 20 cm Scales )

FRONT SIDE, seen in the OPEN BOX ...




... BACK SIDE seen on Top of the Box

A.W.Faber-Castell, Stein bei Nuernberg / Germany             (1953)
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S C A L E S   of  the  FABER-CASTELL     » MATHEMA «     Model 2/84
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DETAIL PICTURES ...




R E M A R K S :                 Production Code = 10 53 = Oct. 1953
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This SR came in a green wooden box. It is a  C U R I O S I T Y  ...

There is a  sqrt(X)-Scale, but no X-Scale  ???  The Idea behind is:
         "The Mathematical Term"    Y = sqrt(X)  <===>  2 = sqrt(4)

What has  SinH, CosH  & TanH  to do with "GRAD" ??? 

A L L  SCALES  ARE BASED ON  THE  400g ( "NEW-GRAD" )  Version  !!!
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   sin( 0g ) = 0 ;   sin( 50g )    = 0.7071 ;   sin( 100g ) = 1 ;
   cos( 0g ) = 1 ;   cos( 66.67g ) = 0.5 ;      cos( 100g ) = 0 ;
   tan( 0g ) = 0 ;   tan( 50g )    = 1 ;        cot( 50g )  = 1
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

This SlideRule was designed in a time periode of discussions in the
"Scientific World" to switch from 360o "DEGREES" to 400g "GRAD"; but
this change never happened in the engineering fields.

... After some exercises, consulting the manual  & ANOTHER OPINION:

    http://www.rechenschieber.org/FC_Mathema.pdf  ===>  CONCLUSION:

THE »MATHEMA« IS  N O T  PRACTICAL FOR ENGINEERING CALCULATIONS !!!

"HOW TO USE THE »MATHEMA« ???"  The MANUAL can be found in ...

    http://sliderule.ozmanor.com/man/man-download.html

Compare the »MATHEMA« SCALE DESIGN with ...

    the ARISTO »HYPERLOG«,
    the PICKETT »N4«,
    the REISS »3227«

              Historical Remarks ...
impressum:
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© C.HAMANN    http://public.beuth-hochschule.de/~hamann    09/29/12