When Was the Sextant Invented?
When Was the Sextant Invented? The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was...
Read MoreWhen Was the Sextant Invented? The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was...
Read MoreHow Does a Tuning-fork Work? A tuning-fork vibrates to give a musical note of definite pitch or frequency and is marked on the fork by a letter or symbol referring to...
Read MoreThe first dish (or radio) telescope was made in 1942 by an American, Grote Reber, of Wheaton, Illinois. He constructed his apparatus after studying the experiments of...
Read MoreWhat Is a Theodolite? A theodolite is a surveying instrument used for measuring horizontal and vertical angles, and has been adapted for specialized purposes such as...
Read MoreWho First Used a Powered Dental Drill? The first powered dentist’s drill was made by George Washington’s dentist, John Greenwood, who adapted his mother’s spinning...
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