Posted 12 years ago
Phatbuddha
(220 items)
A lovely old ivory ruler made in France. I'm not sure how old it is maybe 1930's it's still got the Leather case with a yellow Magnifying glass
A lovely old ivory ruler | ||
| Ivory 7 of 9 |  |  |
A lovely old ivory ruler | ||
| Ivory 7 of 9 | | |
Posted 12 years ago
Phatbuddha
(220 items)
A lovely old ivory ruler made in France. I'm not sure how old it is maybe 1930's it's still got the Leather case with a yellow Magnifying glass
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your slide rule is most likely pre-1970s, as the introduction of scientific calculators in the early 70s rendered these obsolete. Prior to the scientific calculator the slide rule was use as a mechanical calculator by engineers and scientist for complicated logarithmic calculations.
On another post of a slide ruler on this site is a reference to a website that tracks these instruments and has pertinent info on them. Cool piece...
Nice1 guys :)