Month: March 2006

Animated Engines

Animated Engines

Matt writes – “I have loved mechanical things since I was a kid. Engines in particular have always intrigued me. All my life I’ve pored over books, studying cutaway diagrams, hungry to understand how things worked. These pages are an attempt to share that magic.” Thanks Tim! – Link. Here’s how the animations were made […]

HOW TO – Build a home phone-exchange

HOW TO – Build a home phone-exchange

Markus writes – “This miniature, 8-line home telephone exchange (PABX) works with standard telephones and features high-quality, user-friendly progress tones. Connection to telephones is via a two-wire unbalanced loop with a common ground. Only pulse dialling is supported although the exchange could be adapted to use a DTMF tone decoder.” Lots of schematics and photos […]

Railway velocipede

Railway velocipede

From Engineering News of February, 1895 “The wheels have rubber bands 3 ins. wide and 3-16 in. thick on the tread, which make the machine run easily without jar, and also without noise, so that the rider can catch the sound of approaching trains.” – [via] Link. I really want to build one of these […]