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Thacher's Cylindrical Slide Rule Calculating Instrument with Case and Booklet
Item Details
| Type | Thacher’s Calculating Instrument |
| Brand | Keuffel & Esser Co. |
| Materials | Wood |
| Model | 4012 |
| Serial Number | 3053 |
| Period | Early 20th Century |
| Date | 1910 |
| Additional Information | Patented in 1881. |
Condition
- tarnish to metal; minor wear and markings throughout; one of the knobs is loose and does not cause the instrument to rotate; wear and toning to booklet; scratches, wear and scuffs to box with debris accumulation to the interior.
Dimensions
23.75" W x 6.25" H x 6.5" D
- measurements reflect box.
Item #
ITMG018392
