| 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 |
| 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. |