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 MoreWhen Was the Gyroscope Invented? Any spinning object resists attempts to change the direction of its axis, the imaginary straight line round which it revolves. Thus you...
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 MoreWhat Is a Squint? A squint, or strabismus, is the name given to a condition in which both eyes do not point in the same direction. Whilst one eye looks straight ahead,...
Read MoreWhy Do We Have Two Eyes? We have two eyes placed in the front of our heads because we need to be able to judge distances and to see in depth. The change in the position...
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