|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.
|Donor||Collection of Dr. Paul J. Tarantolo Jr.|
(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.|