| Name and Model Number | Stanley Rule and Level Co. No. 6 |
| Country of Origin | USA |
| Date of Manufacture | Offered 1859-1898 |
| Front Scales | Measuring scales in inches up to 24” when opened |
| Back Scales | A B on slider, Girt line scale |
| Scale Length | 30 cm (12 inches) |
| Type of Rule | Rule |
| Construction | Brass slider and hinge and box wood |
| Area of Use | Other |
| Comment | Engineering slide rule for square, circular, and globe calculations. Timber volumes too. Earliest of only two (# 6 & # 16) engineering rules by Stanley was 1859. Engineers scales referred to, were actually engineering type gauge points for power and other calculations.
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| Rarity | RRR |
| Donor | Collection of Clay Castleberry |
| Match Number | 293
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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.
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