Chain link fences are woven with a mechanism that is almost hypnotic to watch, so [Levsha] decided to build his own tiny hand-crank tabletop ... practical use for this device that we can see ...

There are plenty of hand cranked generators to be found online, from tiny devices intended to top up a single phone to sturdy metal boxes intended for battery charging. This one differs from those ...

Description: Hand cranked device that may be used as an AC or DC generator, or as a motor. This thing originally came with some kind of electromagnet which disappeared years ago. I have stuck a couple ...

Tullio Pellegrini. The film explains the workings of a variable shutter in motion picture cameras, detailing its design, functions, and advantages over a standard shutter. It describes how the ...