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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) ******************************************************************* S C A L E S of the FABER-CASTELL » MATHEMA « Model 2/84 =================================================================== DETAIL PICTURES ... |
R E M A R K S : Production Code = 10 53 = Oct. 1953
===================================================================
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 !!!
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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
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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.BHT-Berlin.de/hamann 09/29/12
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