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Re-tic′u-lated mi-crom′e-ter.

Invented by Malvasia, about 1660, who constructed a network of silver wires, crossing each other at right angles, and dividing the field of the telescope into a number of equal squares. It is used for measuring small celestial distances. The reticulated micrometer consists of an eye-piece of low power, having stretched across it a number of wires at right angles to and at equal and known distances from each other. The wires are illuminated with the lantern, and the object measured by noting the number of divisions covered by it. See wire micrometer.

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1660 AD (1)
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