2025/019
Fowler’s Universal Calculator in a fitted leather pouch
c.1940
Fowler’s Universal Calculator in a fitted leather pouch. This circular slide rule is 3.4 in in diameter.
It has two controls: one rotates the scales under a fixed red harline. The other rotates a transparent disc with a black hairline. This enables the user to set an angular separation of the two hairlies to represent a given multiplication (or division) factor which can be used to multiply or divide any number by that factor.
For information on how to use the calculater click here.
| Acquisition Number | 2025/019 |
|---|---|
| Item Type | |
| Short Description | Fowler's Universal Calculator |
| Manufactured by | |
| Date of Manufacture | c.1940 |
| Sub-items | Brown leather slip case |
| Supporting Items | None |
| Makers Number | None |
| Marks | None |
| Dimensions (mm) | 85 (dia) x 10 |
| Donor | Professor Roland Paxton MBE PhD DEng FRSE CEng FICE, Edinburgh |
| Date Donated | October 2025 |
| Materials | Steel, glass and plastic |
| Condition | Good |
| Display Location |
