| Name and Model Number | Vade Mecum |
| Country of Origin | England |
| Date of Manufacture | |
| Front Scales | 7 specialised |
| Back Scales | 5 specialised |
| Scale Length | 32,3 cm maximum |
| Type of Rule | Slide Rule |
| Construction | Wood with brass end-pieces |
| Area of Use | Other |
| Comment | Designed by George Bousfield for the Timber Trade |
| Rarity | RR |
| Donor | Collection of Rod Lovett |
| Match Number | 30 |
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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. |