this will tell your age, if you were into math, back in the early days,,, we used them up to the 60's/70s! Can you tell Ice what it is???
Don't
slide out on me,,, give it a guess!! (
There was a time when electronic calculators did not yet exist. This did not stop us from doing complicated things, like going to the moon, figuring out the double helix, or designing the Boeing 747. In those days, when we needed to compute things, we used slide rules which are marvelous and beautiful instruments!
There are many pages about slide rules on the web, and you can still buy brand new slide rules (40 years old but never used, and still in their factory supplied box) in various places. The purpose of this particular and quite idiosyncratic slide rule page is to describe common scales used on slide rules, and the kind of mathematical expressions that could be evaluated with those scales.
The two images on this page show the two sides of a particular slide rule in my collection. This may be one of the fanciest and perhaps most beautiful slide rules ever made, a Faber Castell Novo Biplex 2/83 N. It's made of plastic, and has 30 scales and 11 cursor marks. The rule is about 13.5 inches long and 2.25 inches wide. You can click on the pictures and see an enlarged image, but that doesn't come close to holding the real thing in your hands. It feels heavy and solid. The slide and cursor move with silky smoothness and yet they stay in place wherever you let go of them. The lettering is crisp and detailed, and pristine! No space is wasted, but the information is not crowded either. Every scale has a purpose.
German made slide rules of that time (the late 1960s) usually come with an accessory plastic ruler. This particular slide rule has a ruler (not shown) that lists common formulas and physical data on one side. Those may be useful for slide rule calculations. However, the other side of that ruler has a detailed list and explanation of common notations in set theory! This is about as useless for slide rule calculations as a list of large mammals. Apparently this slide rule was made when the "new math" was at its zenith and Faber Castell wanted its share of the action.
The above was taken borrowed from another website,,,, he does a great job of explaining the its uses! Ice used one back in the 60's, for a short time while attending School! They would be useless to me today, give me a Texas Instruments hand held led unit any day! My sliding days are over!! LOL
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