|Name and Model Number||Faber Castell 366, System Schumacher |
(Hand-made / Nachbau version)
|Country of Origin||Original – Germany. Hand-made version – U.K.|
|Date of Manufacture||Original – Around 1909. Hand-made version - 2012|
|Front Scales||Original – N1 [N2 I2] I1 plus N -> I table on cursor. |
Hand-made version – I1 N1 [ N2 I2] plus free-spinning N -> I table at centre of rule.
|Scale Length||Original – outermost scale c. 44cm; immermost c 31cm. Hand-made version – outermost scale c. 68cm; innermost c. 48cm.|
|Type of Rule||Slide Rule|
|Area of Use||Other|
|Comment||An unusual rule, constructed for educational purposes, capable of multiplication of one- and two-digit numbers only.
Also arbitrary powers and logarithms. Works in modulo 101. Divisions are equally spaced; not logarithmically scaled.
German manual at: http://rechnerlexikon.de/files/Schum1909.pdf
English translation of above at:
|Donor||Collection of Jerry McCarthy|
|RR||= Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.|
|RRR||= Very rare -- only very few known to collectors; may take several years before one comes up for sale.|
|RRRR||= Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.|