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SPECULUM, the Latin word for a mirror, employed more particularly for a metallic mirror used in a reflecting telescope. In early instruments metallic mirrors, made from an alloy of copper and tin, with the addition of a little arsenic or other metals to increase the whiteness, were customarily employed, but they have now been displaced by the more convenient silveron-glass mirror (see TELESCOPE). Various forms of specula are used in surgery for examining internal organs.

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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