Full Details

Name and Model Number Fowler Artillery Calculator
Country of Origin England
Date of Manufacture unknown
Front Scales Short Scale; Reciprocals; Log Sines (545 - 90); Log Tangents (545 - 45); Log Sines (35 - 545); 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
(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.