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Pliny the Elder, The Natural History (ed. John Bostock, M.D., F.R.S., H.T. Riley, Esq., B.A.) 1 1 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
chytic lava, in which a porous structure has been induced by the expansion of gas while in a plastic state. Campo Bianco, one of the Lipari Islands, which is entirely composed of this substance, is the principal source of supply. It is frequently employed in its natural condition, but more generally in the state of powder. Pump. 1. (Hydraulics.) A device for lifting water by the motion of a piston in a cylinder. Whether they were invented by Danaus, who dug the wells in Argos, 1485 B. C., or by Ctesibus of Alexandria, about 224 B. C., it is not possible to determine. In either case, the origin is Egyptian, and that is the most likely part of the statement. Danaus is said to have been the brother of the Pharaoh Rameses, and to have carried many useful devices from the Nile to the Peloponnesus. The piston working in a cylinder is the piston-blower, a very ancient form of blast for the native smelting-furnaces of Asia, Africa, and Europe. See page 1717. The water-pum