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Please Support RF Cafe by purchasing my ridiculously low-priced products, all of which I created. RF & Electronics Symbols for Visio RF & Electronics Symbols for Office RF & Electronics Stencils for Visio T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads These Are Available for Free |
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Popular Science Book Club 20-in-1 Shop Guide
1966 Popular Science
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February 1939 Popular Science  [Table of Contents]
Wax nostalgic about and learn from the history of early
electronics. See articles from
Popular
Science, published 1872- |
In the days before phone apps could instantly calculate just about anything, many people relied on handy cardboard calculators designed for specific tasks. One example is this two-sided "20-in-1 Shop Guide," provided in 1966 by the Popular Science Book Club. More elaborate cardboard calculators and cross-reference guides featured a sliding element between the two outer pieces, similar to a slide rule. In many ways, these devices are more convenient than phone apps because all the information is visible at a glance, so you immediately know what they can calculate. The images below can be printed and glued to cardboard, but be sure to scale them correctly so the measurement marks remain accurate. I keep a few of these taped to the undersides of my toolbox lids.
Popular Science Book Club 20-in-1 Shop Guide
Copyright: 1996 - 2026 |
About RF Cafe RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
Copyright 1996 - 2026 All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledge My Hobby Website: My Daughter's Website: |
