August 1967 Electronics World
Wax nostalgic about and learn from the history of early electronics. See articles
Electronics World, published May 1959
- December 1971. All copyrights hereby acknowledged.
It wasn't until February 1,
1972, that Hewlett-Packard introduced its
HP-35 electronic calculator. Before that, when you spoke of an
electronics calculator it referred to a computer (likely a vacuum tube type), a
human who specialized in electronics calculations (as NASA and universities referred
to them), or this special slide rule sold by Cleveland Electronics Institute - the
It had special scales for calculating reactance, and resonance, and had common circuit
analysis formulas printed on the back side, and also came with an extensive user's
manual. This full-page advertisement appeared in a 1967 issue of Electronics
Here is an RF Cafe web page dedicated to
engineering slide rules
and my small collection that includes a 515−T. I will gladly accept a donation and
credit you accordingly.
Start Using This Remarkable Electronics Slide Rule
man who's always first to say: "I've got the answer right here!"
Some day everyone in electronics may have a slide rule like this. Till then,
the man who uses one will seem like a wizard as he solves reactance and resonance
problems in 12 to 20 seconds - without pencil and paper.
515-T Slide Rule(made by Pickett)
Send me an
e-mail if you want a PDF file of a partial (10 pages) copy of
the instruction manual.
[Buy the complete manual set
This is a professional slide rule in every detail, a full 10" long, made exclusively
for Cleveland Institute of Electronics, to our rigid specifications, by Pickett,
Inc. It can be used for conventional computation as well as special electronics
calculations. All-metal construction assures smooth operation regardless of climate.
Handsome top-grain leather carrying case has heavy-duty plastic liner to protect
slide rule; removable belt loop for convenient carrying. "Quick-flip" cover makes
it easy to get rule in and out of case.
You also get four full-length AUTO-PROGRAMMED™ Lessons, which teach you
how to use the special electronics scales on the slide rule. These lessons have
been carefully designed to meet the same high educational standards as the electronics
career courses for which our school is famous. Even if you've never used a slide
rule before, you'll soon whiz through the toughest problems with this CIE rule.
Deliberately underpriced. Many men in electronics have told us that this unique
slide rule, leather case, and 4-lesson course easily add up to a $50 value. But
we have deliberately underpriced it at less than $25. Why? Our reason is simple:
we are looking for men in electronics who are ambitious to improve their skills
... who know that this will require more training. If we can attract you with the
low price of our slide rule and course-and impress you with its quality - you are
more likely to consider CIE when you decide you could use more electronics
Send for free booklet. See for yourself why this amazing slide rule and course
have made such a big hit with busy electronics men everywhere. No obligation, of
course - just an opportunity to get in on the best offer ever made to people in
electronics. Just mail coupon, or write Cleveland Institute of Electronics, Dept.
EW-142, 1776 East 17th St., Cleveland, Ohio 44114.
Cleveland Electronics Institute's "Electronics Slide Rule"
Here is the original scan.
Posted March 18, 2022
(updated from original post on 5/6/2013)