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Hyde – Hydrokinetics

Hyde

a city of England in Cheshire. borhood are important coal mines. Pop. about 34,000. ter. There are also manufactures of machinery and margarine. In the neigh- He was born in Roscommon and was educated at Trinity College, Dublin. He was born in Roscommon and was HYDE, DOUGLAS, an Irish author. of the Irish language and Irish customs

Hydraulic Lift

an apparatus on the principle of the hydraulic press, caused by means of a lever to draw up a chain which passes over sets of pulleys, and is thence conducted by leading pulleys over a jib. The weight is by this arrangement raised many times the stroke of the ram. See ELEVATOR.

Hydraulic Mining

a system of mining in which the force of a jet of water is used to sluice down a bed of HYDROAEROPLANE auriferous gravel or earth, which is passed through sluices to detain the particles of gold. which the fall of a column of water in

Hydraulic Ram

a machine by a tube is caused to elevate a portion of itself to a height greater than that of its source.

Hydriodic Acid

in chemistry, hydric iodide, hydrogen iodide, HI. Hydriodic acid is a colorless gas forming in the air. At a pressure of four atmospheres at 0° it is condensed to a liquid. It can be frozen at ordinary temperature by a mixture of ether and solid Co₂ at a temperature of 55°.

Hydrobromic Acid

HBr, a colorless gas, occurring in solution as a colorless, odorless liquid, with a specific gravity of 1.077. Formed when hydrogen and bromine vapor are passed over warm platinum sponge, or when potassium bromide is distilled with phosphoric acid. Used in medicine as a sedative, and in the preparation of various organic compounds.

Hydrocephalus

a form of dropsy in the ventricles of the brain, or in the arachnoid cavity, in children, and usually rapidly fatal, though cases have been known to go on to adult life.

Hydrocyanic Acid

cyanide of hydrogen, hydric cyanide, hydrogen cyanide, prussic acid. Discovered by Scheele in 1782.

Hydrodynamics

a department of science which treats of the nature of liquids in motion, as opposed to hydrostatics, which investigates the condition of their equilibrium when at rest. a HYDRO-ELECTRIC MACHINE, mechanism in which electricity is generated by the friction of steam against the sides of orifices through which it is allowed to escape under high pressure.

Hydrofluoric Acid

hydrogen fluoride, fluoride of hydrogen, hydric fluoride, HF. The anhydrous acid is obtained by neutralizing in a platinum dish the aqueous solution of hydrofluoric acid with caustic potash, and evaporating the solution.

HYDROIDA

Hydrogen Dioxide

hydrogen peroxide, H₂O2, or HO - OH. Obtained by the action of dilute sulphuric acid and barium peroxide, BaO2.

HYDROGEN PEROXIDE (H2O2), a compound of hydrogen and oxygen, containing a larger proportion of oxygen than water, the other compound of these elements.

Hydrokinetics

that branch of hydrodynamics which treats of the application of forces producing motion in fluids, having thus to do with the flow of liquids in pipes, its issue from orifices under certain pressures, etc.