| 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. |
| Back Scales | None |
| 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 |
| Construction | Wood |
| 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: http://dl.dropbox.com/u/66367494/Schum1909.English.pdf |
| Rarity | RRRR |
| Donor | Collection of Jerry McCarthy |
| Match Number | 69 |
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| 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. |