What is tirling pin?

Tirling pin is a mechanical device that is used to convert rotary motion into reciprocating motion. It consists of a cylindrical rod that is mounted off-center in a circular disk or wheel. As the disk or wheel rotates, the offset position of the rod causes it to move up and down, producing a reciprocating motion.

Tirling pins have been used for centuries in various mechanical devices, including clocks, pumps, and engines. They are also used in toys and art pieces as a means of creating interesting and unpredictable movements.

The name "tirling pin" comes from the Scottish word "tirl," which means to rotate or spin, and "pin," which refers to the cylindrical rod. The device is also sometimes called a "wobbler" or a "whirlygig."