rules have come in different formats over the years. The most familiar is probably the 3-part model with a fixed
outer frame and a sliding inner rod, and a sliding clear window with a reticle line etched into it for aligning
numbers (the cursor). While far from being any type of "collection," I do have a couple nicely preserved models.
The ones from Keufel & Esser (K&E
) are at the top of the table below. The
Beginner's slide rule model is very basic with graduations on one side and some conversions on the other. The best
of all is the Pickett N600 ES
Log-Log that is in new condition and
actually still has the box, leather case, instructions and certificate. The
Pickett N600 ES is the
slide rule model that went to the moon with the Apollo astronauts (not the one I own, of course).
a few of the cardboard calculators I have are at the bottom. Probably only the VSWR Calculator from M/A-COM can be
My good friend Patrick Fitzgerald bestowed it upon me when I went to work for him at General Electric right out of
college. I can recall some of the older engineers still using slide rules there when I arrived in the 1980s. In
fact, the first algebra textbook I had in a community college right out of high school in 1976 had a section in it
on how to use a slide rule. The Sterling 684 plastic slide rule that I
bought at the bookstore is show below. Shortly thereafter, the HP-35 hit the market and the world changed forever
(now that was truly a disruptive technology).
◊ Here is the definitive source: International Slide Rule
- Slide Rule
of books, manuals, instructions and ephemera.
on how to use a slide rule.
◊ Or, try the Slide Rule Guy
◊ See the The
Quick and Easy "Lawrence" Slide Rule Instruction Book
The Slide Rule Universe
◊ Visit the Oughtred Society
(William Oughtred -
inventor of the slide rule in 1622)
new-in-the-box, mint condition
◊ Virtual Slide Rules:
Standard slide rule
EngCom.net, Pickett slide
◊ Here is a website on
(slide rules and other instruments of math, drafting, science, and music)