cement copper (sementkop"er)

Copper precipitated by cementation. cement-duct (sē-ment'dukt), n. The duct of a cement-gland of a cirriped. Darwin. See second cut under Balanus. cementer (se-men'ter), n. that cements. A person or thing Language, the great instrument and cementer of society. Locke . Friendship! mysterious cement of the soul! Sweet'ner of life! and solder of society. Blair, The Grave, 1. 88. 7. A compound made of pitch, brick-dust, plaster of Paris, etc., used by chasers and other artificers to put under their work that it may lie solid and firm, for the better receiving of the impre ion made by the punches and other tools. E. Phillips, 1706.- Amber cement, a solu tion of hard copal in pure ether, of the consistency of castor-oil. E. H. Knight.-Armenian cement. See Armeni an. - Bituminous cement. See bituminous. - Cement substance, the sparse intercellular substance of endothelium which stains with nitrate of silver. - Chalcedony cement, a cement composed of one volume of burnt chalcedony, one volume of lime, and two volumes of white sand. It has a glaze like polished marble. Glycerin cement, a cement made of glycerin and litharge, used for metals and for packing joints. It is useful for galvanoplastic purposes, as it reproduces a surface very delicately and accurately. - Hydraulic cement. See 2.Iron cement, a cement used for luting the sockets and spigots or flanges of cast-iron pipes, and for calking the seams of steam-boiler plates. It consists of sal ammoniac, sulphur, and finely pulverized castings or borings made into a paste. Portland cement, Roman cement. See 2.- Royal cementt, a composition consisting of 1 part of sal ammoniac, 2 parts of common salt, and 4 parts of pot ters' earth or powdered bricks, the whole moistened with E. Phillips, 1706.- Rubber cement. (a) Clean caouturine, and used in the cementation or purifying of gold. chouc triturated with a small quantity of sulphur and di olved in benzine or some other hydrocarbon. It is used for covering cloth of which boots, shoes, coats, belting, etc., are made. (b) A cement for securing rubber rings or plates to metal or wood. It consists of a solution of shellac in ten times its own weight of strong ammonia, left for a considerable time to soften without heat. Also called caoutchouc cement. E. H. Knight.