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 also found later…
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Instrument
How 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 it
Who Made the First Dish Telescope?
The first dish (or radio) telescope was made in 1942 by an American, Grote Reber, of Wheaton, Illinois. He constructed his apparatus after s
What Is a Theodolite?
A theodolite is a surveying instrument used for measuring horizontal and vertical angles, and has been adapted for specialized purposes such
Who First Used a Powered Dental Drill?
Who First Used a Powered Dental Drill? The first powered dentist’s drill was made by George Washington’s dentist, John Greenwood, who ad