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mercury telescope

15.04.2009

Back in 1908, the American physicist Robert Wood built a mirror telescope in which the surface of mercury in a rotating basin half a meter in diameter served as a concave mirror.

In 2009, a telescope based on this principle, but much larger - 4 meters in diameter - should come into operation in India. It is created by an international consortium of scientific institutions, funded by Belgium and Canada.

The disadvantage of telescopes of this kind is the impossibility of tilting, aiming and turning after the object of observation, because then the mercury will pour out of the rotating vessel. However, in some astronomical studies, this shortcoming is of no fundamental importance and is atoned for by the simplicity and low cost of creating large-diameter mirrors.

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