Two years ago (May 9, 1895) we drew attention to two memoirs by Prof. Righi, who in 1893 succeeded in producing and investigating the behaviour of Hertzian waves only a few centimetres in length. He ...
Binoculars and Periscopes invert an image to make an object appear closer. There are two types of prisms that can be used for binoculars: Porro and Roof Prisms. Porro prisms are used in a pair to ...
IT is reported from Italy that three optical prisms formerly belonging to Sir Isaac Newton have now found a permanent resting place in the Museum of Treviso. The prisms in question were originally in ...
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