Flying Shuttle

In 1733, he received a patent for his most revolutionary device: a "wheeled shuttle" for the hand loom.[21][22] It greatly accelerated weaving, by allowing the shuttle carrying the weft to be passed through the warp threads faster and over a greater width of cloth. It was designed for the broad loom, for which it saved labour over the traditional process, needing only one operator per loom (before Kay's improvements a second worker was needed to catch the shuttle).
Kay always called this invention a "wheeled shuttle", but others used the name "fly-shuttle" (and later, "flying shuttle") because of its continuous speed, especially when a young worker was using it in a narrow loom:
a speed which cannot be imagined, so great that the shuttle can only be seen like a tiny cloud which disappears the same instant.