hydro-electric

(hi’dr6-6-lek’trik), a. [ vdwp (idp-), water, + E, electric.] Effecting the absorbed or occluded in a remarkable manner by certain metals when they are heated, as though it formed a kind development of electricity by a certain use of of alloy with them. Hydrogen burns in air with a very steam: as, a hydro-electric machine.—Hydro pale blue flame and intense heat, the sole product of com electric machine, a machine for generating electricity busti on being water, H20, which is the protoxid of hydro by the escape of steam under high pre ure from a series of gen. A mixture of two volumes of hydrogen and six of jets connected with a strong boiler, in which the steam is air or one of oxygen explodes violently when brought in contact with a flame or the electric spark. Hydrogen is not specifically poisonous when inhaled, but is fatal to life by preventing or hindering acce of oxygen to the blood. It is prepared by the action of dilute sulphuric acid on zinc or iron, by pa ing steam through a red-hot tube filled with iron turnings, by the electrolysis of water, and in a variety of other ways. Hydrogen occurs free in nature in small quantity in the emanations of volcanoes and of some oil-wells, but generally it is found only in its combinations, which are universally distributed. One ninth of the weight of water consists of hydrogen, and it is an indispensable element of every animal or vegetable structure. It is a component of all acids, and its replacement in them by bases produces salts. In December, 1877, and January, 1878, the French chemists Cailletet and Pictet succeeded in liquefying hydrogen, and the latter in solidifying it, by means of extreme pre ure and cold produced in special forms of apparatus independently invented by them.—Arseniureted hydrogen, See arseniureted.— Bicarb ure ted or heavy carbureted hydrogen. Same as ethylene.—Hydrogen chlorid, iodide, bromide, etc. Same as hydrochloric — acid, hydriodic acid, etc.— Hydrogen sulphid, or sulpeep hydrogen, H»2S, a colorle inflammable gas Armstrong's Hydro-electric Machine. aving a sweetish taste and an exceedingly fetid smell resembling rotten eggs. It is extremely poisonous when produced. The jets of steam (which have to pa through inhaled. It has feeble acid properties, and its compounds a cooling-box) are electrified by friction. Positive elecwith bases are called sulphids. It occurs in the emanatricity is collected by directing the steam upon a metal tions of volcanoes, and is evolved when animal or vegetacomb communicating with an insulated conductor. ble ti ue containing sulphur decays. It also occurs in