who invented slide rule and in what year
Slide rule The slide rule was invented around 1620â€“1630, shortly after John Napier's publication of the concept of the logarithm. In 1620 Edmund Gunter of Oxford developed a calculating device with a single logarithmic scale; with additional measuring tools it could be used to multiply and divide.[17] In c. 1622, William Oughtred of Cambridge combined two handheld Gunter rules to make a device that is recognizably the modern slide rule.[18] Like his contemporary at Cambridge, Isaac Newton, Oughtred taught his ideas privately to his students. Also like Newton, he became involved in a vitriolic controversy over priority, with his one-time student Richard Delamain and the prior claims of Wingate. Oughtred's ideas were only made public in publications of his student William Forster in 1632 and 1653.
Cha Cha Slide DJ Casper wrote the lyrics for the original around January 1998 and recorded his performance of the original version of the "Casper Slide Part 1" in January 1998. The song was heavily inspired by the Chicago stepping movement.[citation needed] Around June 12, 1999, Perry recorded a second version of the song, entitled "Casper Slide Part 2," at the home studio of Fred Johnson with the help of Hollywood Scott, band leader for the Platinum Band. Perry recorded and released the song at his own expense and manufactured copies and distributed them with the help of Gardner Douglas ("Cisco"), owner of the Cisco's Music World record stores in Chicago, Illinois. The song was played at various night clubs and was used by Perry's nephew, a fitness trainer at Bally Total Fitness Health Club in Chicago's Hyde Park neighborhood, as the music for a step aerobics class.[citation needed]