You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use it? Really? All the scales? That’s what we thought.

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This pocket-sized white plastic ...

Master the Blake’s Hitch knot — a reliable and versatile slide-and-grip knot perfect for climbing, arborist work, or securing lines. This step-by-step tutorial will show you how to tie it quickly and ...

The game of football is constantly evolving as it gets more aggressive as players get faster and stronger. But, the core issue of player safety, especially for the league's most valuable assets, ...

A new waveguide slide rule app for mobile devices helps engineers to determine operating parameters and material specifications by entering rectangular waveguide (WR) dimensions. A free rectangular ...

Try this quick experiment. Do a Google search for ‘Steve Jobs presentation slides.’ Hit images. You’ll find hundreds of photos from Jobs’ now-famous keynotes. Look closely at the slides and you’ll ...

IT is convenient to be able to check quickly whether the line of a slide rule cursor is accurately at right angles to the scale. We can test the correspondence of a number and its square, but if “log ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...