Benzine
A light oil of petroleum used for cleaning movements. For directions for use see Watch Cleaning.
BERTHOUD, FERDINAND. A Swiss horologist who was born in 1729 and died in 1807. At the age of nineteen he visited Paris, never afterward leaving it. Saunier says that "his technical training was matured and perfected by contact with the great masters of that day, of whom he subsequently became a rival. He was possessed of a very extensive knowledge and real talent, coupled with indefatigable energy; these are sufficient to explain and justify his great reputation. He published ten quarto volumes on horology. Berthoud did much valuable work, and his name will therefore long remain one of the glories of the horological art."
BERTHOUD, LOUIS. A French chronometer maker and nephew of Ferdinand Berthoud. He died in 1813.