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GoTo mounts are pre-aligned before use. When it is powered on, it may ask for the user's latitude, longitude, time, and date. It can also get this data from a GPS receiver connected to the telescope or built into the telescope mount itself, and the mount controller can have its own real time clock.
However, it was now possible to mount a twelve inch tube horizontally in an acceptable cabinet size. As a result of these size limitations, rear projection systems became popular [8] [9] as a way of producing television sets with a screen size larger than 12 inches. [10]
The articulating screen is known under different other names such as flip-out screen, flip screen, adjustable screen, articulated screen, or hinged screen. According to the way it moves, there are five main types: The display moves around one axis, so that it only tilts. It is called tilting screen or tiltable screen.
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A Nipkow disk (sometimes Anglicized as Nipkov disk; patented in 1884), also known as scanning disk, is a mechanical, rotating, geometrically operating image scanning device, patented by Paul Gottlieb Nipkow in Berlin. [1] This scanning disk was a fundamental component in mechanical television, and thus the first televisions, through the 1920s ...
Mechanical TV usually only produced small images. It was the main type of TV until the 1930s. Vacuum tube television, first demonstrated in September 1927 in San Francisco by Philo Farnsworth , and then publicly by Farnsworth at the Franklin Institute in Philadelphia in 1934, was rapidly overtaking mechanical television.