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1A machine is a combination of timbers fastened together, chiefly efficacious in moving great weights. Such a machine is set in motion on scientific principles in circular rounds, which the Greeks call κυλικη κἱνησις. There is, however, a class intended for climbing, termed in Greek ἁκροβατικὁν, another worked by air, which with them is called πνευματικὁν, and a third for hoisting; this the Greeks named βαρουλκὁς. In the climbing class are machines so disposed that one can safely climb up high, by means of timbers set up on end and connected by crossbeams, in order to view operations. In the pneumatic class, air is forced by pressure to produce sounds and tones as in an ὁργανον.
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