Online Encyclopedia

SPECULUM

Online Encyclopedia
Originally appearing in Volume V25, Page 632 of the 1911 Encyclopedia Britannica.
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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.
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JAMES SPEDDING (18o8–1881)

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