| Name and Model Number | Unique Rolling Mill Slide Rule - Types 1 & 2 |
| Country of Origin | England |
| Date of Manufacture | c. 1950 |
| Front Scales | Specialized scales and curves |
| Back Scales | none |
| Scale Length | 10" |
| Type of Rule | Slide Rule |
| Construction | Celluloid on wood, with 2 slides and cursor |
| Area of Use | Technical |
| Comment | For rolling mill separating force and torque.
Copyright The Loewy Eng. Co. Ltd. London. Developed by A. Mogiljanskij. Listed as a prototype in Peter Hopp’s Slide Rules book. A slightly different version exists (Type 2). See details. |
| Rarity | RRR |
| Donor | Collection of Ron Knapp |
| Match Number | 264 |
| 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. |