| Name and Model Number | Belcher Brothers Gunters Rule |
| Country of Origin | USA, New York |
| Date of Manufacture | 1850-1900 |
| Front Scales | Inches LEA Rhumbs ML Chords Sines Tan Tan |
| Back Scales | Rhumbs t Rhumbsm Numbers Sines sinesm tan meridians equal parts |
| Scale Length | 61 cm (24 inches) |
| Type of Rule | Rule |
| Construction | Boxwood, lines by a dividing engine, letters and numbers stamped by hand |
| Area of Use | Generic |
| Comment | Used for navigation, astronomy, surveying. A great device developed by gunter in the very early 1600s and a precursor to the slide rule
|
| Rarity | RRR |
| Donor | Collection of Clay Castleberry |
| Match Number | 352 |
| 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. |