| Name and Model Number | Slater’s rule |
| Country of Origin | U.K. |
| Date of Manufacture | ~1850 to early 20th century |
| Front Scales | Soho slide rule scale variant |
| Back Scales | Tables of weaving facts and figures |
| Scale Length | 11" |
| Type of Rule | Slide Rule |
| Construction | Boxwood and brass |
| Area of Use | Other |
| Comment | A 2-foot, 2-fold rule used for textile and weaving calculations.
Slater’s rule has an incredible collection of information and instructions engraved on the two sides (four legs) of the 2-2 rule, and examples are known from a number of midlands makers. This example by Gleave of Manchester dates it to about 1890, however it has been stated that the majority come from either Preston or Rabone. |
| Rarity | RR |
| Donor | Collection of an English gentleman |
| Match Number | 41 |
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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. |