| Name and Model Number | Fowler Artillery Calculator |
| Country of Origin | England |
| Date of Manufacture | unknown |
| Front Scales | Short Scale; Reciprocals; Log Sines (5°45’ - 90°); Log Tangents (5°45’ - 45°); Log Sines (35’ - 5°45’); Logarithms |
| Back Scales | Conversion Scales: Yards/Miles; Miles/Kilo.M.; Inches/Millimetres; Millimetres/Inches (8ths); Inches (10ths) |
| Scale Length | Short scale ~ 7.5” (19 cm) |
| Type of Rule | Watch Type |
| Construction | Metal with paper scales and glass windows. |
| Area of Use | Military |
| Comment | Double sided pocket watch calculator with two stems to rotate paper scales and front cursor.
Fixed cursors on both glass faces. Blankenhorn and De Cesaris Model 2CA1b. |
| Rarity | RRR |
| Donor | Collection of Dr. Paul J. Tarantolo Jr. |
| Match Number | 17 |
| 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. |