Science Art: Tackles, 1905.

Scientific illustration of pulleys in block and tackle arrangements, increasing mechanical efficiency.

Scientific illustration of pulleys in block and tackle arrangements, increasing mechanical efficiency. Click to embiggen

Pulleys and rope, arranged to make lifting heavy weights easier. I’ve been messing around with boats lately, lowering a 30-foot mast with a lot of help. Pulleys are an amazing invention.

These are pictured in the Manual of Military Engineering, published in 1905 by the War Office of Great Britain… but I found them over here.