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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 !!! +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 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: ******************************************************************* © C.HAMANN http://public.beuth-hochschule.de/~hamann 09/29/12 ```