What is the basic concept of how a slide rule works?
A slide rule works by adding or subtracting the numerical exponents of numbers for multiplication or division, respectively. Thus, numbers to be multiplied or divided are converted to their logarithmic values and their exponents are added or subtracted.
Who invented the slide rule and in what year?
William Oughtred
The slide rule was invented by William Oughtred in the 1600’s, but only began to be widely used in the mid 1800’s after a French artillery officer named Amedee Mannheim developed a version that became popular among engineers. By the early 1900’s engineering students in the US were commonly taught to use slide rules.
How do you lubricate a slide rule?
To lubricate, put a little white petroleum jelly (White Vaseline) on the edges and move the slider back and forth several times, Wipe off any excess lubricant. Do not use ordinary oil as it may erentually discolor rule surfaces.
What kind of slide rule is Pickett n1010?
Pickett N1010-ES A simpler model trigonometric slide rule from Pickett, also in “eye-saver” yellow aluminum. I like this rule mainly because I got it mint in the original box, including all the original promotional material.
How big is the largest Pickett slide rule?
Pickett N4-ES One of the most advanced slide rules ever made, with a whopping 34 scales! This is the largest slide rule I’ve ever seen, made in Pickett’s trademark “eye-saver” yellow aluminum (copyright date is 1959).
Where is the number 81 on a Pickett slide?
The right end of the slide bears the form of the Pickett logo that was used between 1958 and 1962. The number 81 is printed above the logo, and MADE IN U.S.A. is printed below it. The back of the base has LL2, DF, D, and LL3 scales, with CF, Ln, L, CI, and C scales on the front of the slide.
Where did Pickett and Chartpak make slide rules?
In the mid-1970s, Pickett moved to Nogales, Mexico, ceased making slide rules, and was gradually subsumed into Chartpak, Inc., a maker of art supplies and office products now located in Leeds, Mass. Its compact size and large number of scales made this model popular with engineers who had excellent vision.