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em.), a compound of two sulphides. -- Hydrogen sulphide. (Chem.) See under Hydrogen. -- Metallic sulphide, a binary compound of sulphur with a metal.

ur dioxide, oxygen (from the air), steam, and nitric fumes. It attacks and dissolves many metals and other intractable substances, sets free most acids from their salts, and is used in the manufacture of hydrochloric and nitric acids, of soda, of bleaching powders, etc. It is also powerful dehydrating agent, having a s…

A round pit of stone, lined with clay, for receiving the metal on its first fusion. Ray.

r is deep violet, or nearly black, with brilliant green reflections. The gorget is bright metallic green. -- Superb warber. (Zoöl.) See Blue wren, under Wren. -- Su*perb"ly, adv. -- Su*perb"ness, n.

A form of machine for dressing the surface of wood, metal, stone, etc.

variously shaped or grooved on the end or face, used by blacksmiths and other workers in metals, for shaping their work, whether sheet metal or forging, by holding the swage upon the work, or the work upon the swage, and striking with a sledge. Swage block, a perforated block of iron, having grooved sides and adapted…

y shaking it with others in a bag, so that the friction wears off a small quantity of the metal. The only use of it [money] which is interdicted is to put it in circulation again after having diminished its weight by "sweating", or otherwise, because the quantity of metal contains is no longer consistent with its impre…

The sweeping of workshops where precious metals are worked, containing filings, etc. Sweep net, a net for drawing over a large compass. -- Sweep of the tiller (Naut.), a circular frame on which the tiller traverses.

One who extracts the residuum of precious metals from the sweepings, potsherds, etc., of refineries of gold and silver, or places where these metals are used.

o tack one piece of cloth to another; to tack on a board or shingle; to tack one piece of metal to another by drops of solder.

A metallic binding, tube, or point, at the end of a string, or lace, to stiffen it.

the tail of the buddle or washing apparatus. It is dressed over again to secure whatever metal may exist in it. Called also tails. Pryce.

e, of a heavenly sign, constellation, or planet, engraved on a sympathetic stone, or on a metal corresponding to the star, in order to receive its influence.

A long sheet-metal pipe for a chimney top.

A shallow metallic cup or drum, with a thin elastic membrane supporting a writing lever. Two or more of these are connected by an India rubber tube, and used to transmit and register the movements of the pulse or of any pulsating artery.

ng arguments of state. Shak. To tang bees, to cause a swarm of bees to settle, by beating metal to make a din.

of passing through the part and receiving a nut. See Illust. under Bolt. -- Tap cinder (Metal.), the slag of a puddling furnace.

A tapeline; also, a metallic ribbon so marked as to serve as a tapeline; as, a steel tape. Red tape. See under Red. -- Tape grass (Bot.), a plant (Vallisneria spiralis) with long ribbonlike leaves, growing in fresh or brackish water; -- called also fresh-water eelgrass, and, in Maryland, wild celery. -- Tape needle.…

igmented layer of the choroid coat of the eye in many animals, which has an iridescent or metallic luster and helps to make the eye visible in the dark. Sometimes applied to the whole layer of pigmented epithelium of the choroid.

A piece of wood or sheet metal fitted into a ditch to dam up the water so as to overflow a field. [U. S.]