![]() The Americans later named it “ Birthday Clock” because this type of clock was offered for a birthday, and it worked until the next birthday. The pendulum of this clock is usually made up of four spheres that rotate and return very slowly around an axis. It was mostly sold under a glass or plastic globe or in a glass lantern. Very popular in the late 1940s and 1950s, like this German Kundo from 1950s, the Anniversary clock has a mouvement that allows continuous operation for 400 days, or even 1,000 days. In Germany, around 1879, Anton Harder developed a 400-day twist clock. In 1855, Crane obtained another patent for a multi-weight clock. The commercialization took place in small quantities around 1845 in New York by J. Crane, also obtained patents in 18 for a twisted clock of 8, 30 or 365 days of operation. In 1793, an Englishman, Robert Leslie, was granted a patent for a twisted clock. ![]() The pendulum is called torsion or “twisting” when its very heavy bob suspended from a wire is able to undergo a long period of vibration with minimal energy. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |