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can be printed from. Prepared chalk or oxide of zinc is pressed upon a smooth plate by a hydraulic press, and the design is drawn upon this in a peculiar ink which hardens the surface wherever it is applied. The surface is then carefully rubbed or brushed, leaving the lines in relief.

ment employed by the French artist, Adrian Gusgnet, and consisting essentially of a basic hydrate of chromium. -- Methyl green (Chem.), an artificial rosaniline dyestuff, obtained as a green substance having a brilliant yellow luster; -- called also light-green. -- Mineral green. See under Mineral. -- Mountain green…

In hydraulic mining, gratings used to catch and throw out large stones from the sluices. [Local, U. S.] Raymond.

A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite.

A division of Hydroidea including the hydra. See Hydra.

ceeding that of the atmosphere; -- said of steam, air, water, etc., and of steam, air, or hydraulic engines, water wheels, etc.

ubber, or other material, and used for conveying fluids, especially water, from a faucet, hydrant, or fire engine. Hose carriage, cart, or truck, a wheeled vehicle fitted for conveying hose for extinguishing fires. -- Hose company, a company of men appointed to bring and manage hose in the extinguishing of fires. [U.S…

from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; -- called also humic acid, ulmin, gein, ulmic or geic acid, etc.

Having the form or structure of a hydra.

The group of hydroids to which the fresh-water hydras belong.

A combining form from Gr. Hydra).

Related to, or resembling, the hydra; of or pertaining to the Hydroidea. -- n.

stase of malt, ptyalin of saliva, and boiling dilute sulphuric acid all convert starch by hydration into dextrin and sugar. Nearly all of the digestive ferments are hydrolytic in their action.

A salt supposed to be formed by a hydracid and a base.

applied, the principle involved being the same as in the hydrostatic bellows. Also called hydraulic press, and Bramah press. In the illustration, a is a pump with a small plunger b, which forces the water into the cylinder c, thus driving upward the large plunder d, which performs the reduced work, such as compressing…

basic radical; as, potassium hydrosulphide, KSH. The hydrosulphides are analogous to the hydrates and include the mercaptans.

One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian.

Containing water of hydration or crystallization.

A hydrate; a substance containing hydrogen and oxygen, made by combining water with an oxide, and yielding water by elimination. The hydroxides are regarded as compounds of hydroxyl, united usually with basic element or radical; as, calcium hydroxide ethyl hydroxide.

consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, etc.