| Name and Model Number | Wilkinson’s rule |
| Country of Origin | UK |
| Date of Manufacture | c1877 |
| Front Scales | Routledge variant, D = 1 - 10 |
| Back Scales | Gauge points, conversion factors, circles and pumping engine constants |
| Scale Length | 11” |
| Type of Rule | Other |
| Construction | Boxwood & brass |
| Area of Use | Other |
| Comment | A 2-foot, 2-fold rule used for engineering.
Wilkinson’s rule is basically a Routledge slide rule with a few "improvements", namely a Log scale which allows the mantissa of the logarithm to be ascertained across two legs of the rule. Also it has additional scales compared to its parent, the Routledge engineers rule. Nothing is known about T. Wilkinson, other than that he was an engineer who worked in the Midlands in the late 19th century. |
| Rarity | RR |
| Donor | Collection of an English gentleman. |
| Match Number | 62 |
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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. |