Full Details

Name and Model Number Aston & Mander Mark VI
Artillery Slide Rule
Country of Origin London England
Date of Manufacture 1915
Front Scales Yards, minutes in Apex angle, battery range in yards
Back Scales Yards, angles, angles
Scale Length 40 cm (15.5 in)
Type of Rule Slide Rule
Construction Believed to be German Silver or nickel silver. It is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
Area of Use Military
Comment Used for calculating angles for artillery battery firing in World War I. Very heavy metal construction very well made
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 343
(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.