At the risk of being characterized as an old fart, WC introduces a sometime feature describing various items of technology that were state of the art in his lifetime, but have also vanished in his lifetime. Think of it as a chronicle of change.
We’ll start with the slide rule. Invented by Reverend William Oughtred in about 1622, who utilized John Napier’s work on logarithms and Edmund Gunter’s work on logarithmic scales, the slide rule was a mechanical analog computer. Slide rules were ubiquitous by the 1960s; one went to the Moon with Buzz Aldrin.
They were indispensable to any science student; WC owned a Simplex1 very like this one, purchased at the old Yukon Office Supply in 1968 for about $40.00, probably $100 adjusted for inflation. It was especially important for Chemistry class; the one time WC forgot to take it to class Prof. Swinehart (yes, really) sprang a pop quiz on us.2
Really, the slide rule was doomed from the moment of the invention of the transistor in 1947. From that point, it was a matter of shrinking the transistor and economies of scale. The pocket calculator – more accurate, faster and it handled the orders of magnitude that the slide rule left to the user – began to supplant the slide rule in the early 1970s. The last slide rule was manufactured by Keuffel & Esser on July 11, 1976. In 1978, WC bought an early HP calculator (an HP 18)3 and his slide rule was consigned to the bottom drawer of his desk. Computer spreadsheets also contributed to the demies of the slide rule.
Today they are a collector’s item. There is a collectors’ club, called the Oughtred Society, and a slide rule museum. There’s some irony that calculations leading to the digital pocket calculator were made on the slide rule. From indispensable to completely obsolete in a very few years.
- Fifteen dollars on eBay. ↩
- WC apologizes again to RKY for barging into the dorm room to get that slide rule at an, ah… awkward time for RKY. My mistake. ↩
- WC was an enthusiastic HP programmable calculator user, at one point owning a powerful HP 41C with memory cards, a printer and function cards. It was an expensive habit, and led to even more expensive computer hardware. ↩