| Name and Model Number | Farmar’s Publican Rule |
| Country of Origin | England |
| Date of Manufacture | 1898 - 1905 |
| Front Scales | various |
| Back Scales | various |
| Scale Length | 12.25 in |
| Type of Rule | Slide Rule |
| Construction | Boxwood with brass end plates |
| Area of Use | Brewing |
| Comment | Proofing rule for pub owner.
Publican calculations for proof and profit. Believed to be the precursor of Farmar’s Publican No. 1. |
| Rarity | RRR |
| Donor | Collection of Clay Castleberry |
| Match Number | 238 |
| Thumbnail (Click Picture for Details) |  |
| In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen |
| (1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD. |
| • RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace. |
| • RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale. |
| • RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale. |