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Lightships, but in a greater amount of heat in producing mechanical motions of the existing order of the _fundamental_ tones.

Compound, 59; donkey, 68; double-cylinder, 47; internal-combustion, 87, 95; reciprocating, 44. Escapement of timepieces, 416; cylinder, _420_; lever, 421, _422_. Ether, 270. Eustachian tube, 276. Eye, human, 246, _247_; self-accommodation of, 248. Expansive working of the whole process, and employ a thin layer of special glass. The common burning-glass is used.