| Name and Model Number | Japanese Artillery Slide Rule |
| Country of Origin | Japan |
| Date of Manufacture | c.1930 - 40 |
| Front Scales | Translated, distance [ distance 1/6-map-scale 1/6400-map-scale ] distance |
| Back Scales | [ Sin Sin ], beveled Edge Scale 0 to 28 cm, Lower edge scale 0 to 140-equal-parts |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Heavy brass; 28-cm x 3.4-cm Scales engraved. Missing cursor. |
| Area of Use | Military |
| Comment | One piece closed frame. Identical examples are in the collections of the Power House Museum (PHM), Sydney Australia (dated 1920 - 29) and in the Smithsonian National Museum of American History (NMAH), Washington, DC (found in an artillery dump in Japan in Oct., 1945). Scale markings are in simple Kanji. There are no maker's marks. Translations are from NMAH, scale descriptions from PHM. This example is missing a brass framed glass cursor. |
| Rarity | RRR |
| Donor | Collection of Ed Chamberlain |
| Match Number | 180 |
| 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. |