A Kökény-féle gyakorló logarléc
Description
This slide rule is from about 1950s, and according to the short instructions printed on the inner side of the slide, was made by Károly Kökény who was a secondary school teacher in Miskolc. The scales printed on the body and on the slide are identical, both are photocopies of the scales from Gamma's 1252 pocket slide rule, but has been magnified and added two more constants and scale markings to help easier use. The window is a sheet of celluloid with 3 hairlines. This rule doesn't contain trigonometric scales.
| Manufacturer: | Kökény Károly (Hungary) |
| Mfg. date: | 1950-es évek |
| Size: | 196×36×5 mm |
| Purpose: | iskolai standard slide rule |
| Material: | body: cardboard scales: cardboard |
| Scale length: | 15 cm (6-inch) |
| Scale order: | one-sided basic front: K Ah | Bh CIh Ch | Dh L |
| Window: | celluloid with 3 indices |
Exercising slide rule made by Kökény Károly: there was brief instructions for use on the back
