| Name and Model Number | I. R. & H. Stebbing |
| Country of Origin | England, High Street Southampton |
| Date of Manufacture | Believed to be about 1835 |
| Front Scales | Trig scales, SIN TAN MER LEA RUM CHO |
| Back Scales | Measuring scales with two verniers |
| Scale Length | 30 cm (12 inch) |
| Type of Rule | Slide Rule |
| Construction | Boxwood scales laid out by dividing engine, numbers and letters hand stamped. Starting and gauge points have embedded brass divider point locations. |
| Area of Use | Nautical |
| Comment | Gunter’s Scale or Gunter’s Rule. Gunter was first to lay out logarithmic scales on a stick – like this rule. Application was usually navigation or astronomy calculations. |
| Rarity | RRR |
| Donor | Collection of Clay Castleberry |
| Match Number | 372
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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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