John Logie Baird gave the first demonstration of a colour television transmission on July 3rd, 1928. The leading pioneer in the creation of television, John Logie Baird, was a Scotsman, born in 1888, the son of a Presbyterian minister, and educated in Glasgow. An electrical engineer and an eccentric genius, he was no businessman, his health was precarious and after a time spent marketing socks, jam and soap he suffered a nervous breakdown.
A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth (1â60) of one degree. As one degree is 1â360 of a circle, one minute of arc is 1â21600 of a circle (or, in radians, Ïâ10800). It is used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying and marksmanship.
Like this: The expression for angular momentum is: L=Ixxomega Where I is the moment of inertia and omega is the angular velocity. Angular momentum is conserved so if I is decreased you can see from the expression that omega must increase. The skater in the graphic has utilised this principle. She brings in her arms to decrease her moment of inertia. As a result her angular velocity has increased i.e she spins faster.