Cement, Transpar′ent. See Cement, Elastic.
Cement, Turn′ers’. Prep. Beeswax, 1 oz.; resin, 1⁄2 oz.; pitch, 1⁄2 oz.; melt, and stir in fine brickdust, q. s.
Cement, Univers′al. See Cement, Parabolic.
Cement, Var′ley’s. Syn. Varley’s mastic. Black resin, 16 parts; beeswax, 1 part; melt, add whiting (sifted, dried by a dull-red heat, and allowed to cool), 16 parts; and stir until nearly cold.
Cement, Water. Prep. 1. From good grey clay, 4 parts; black oxide of manganese, 6 parts; limestone (reduced to powder by sprinkling it with water), 90 parts; mix, calcine, and powder.
2. Mix white iron ore (manganese iron ore), 15 parts, with lime, 85 parts; calcine and powder as above. Both this and the preceding must be mixed up with a little sand for use. A piece thrown into water rapidly hardens.
3. Fine clean sand, 1 cwt.; quick-lime, in powder, 28 lbs.; bone ashes, 14 lbs. The above are beat up with water for use. See Cement, Hydraulic, &c.
Cement, Waterglass. For glass, earthenware, porcelain, and all kinds of stoneware, these cements are excellent. A cement for glass and marble is prepared by rubbing together one part of fine pulverised glass, and two parts of pulverised fluorspar, and then adding enough waterglass solution to give it the consistency necessary in a cement.
Waterglass mixed with hydraulic cement to a thick dough makes a good cement for the edges and joints of stone and marble slabs. It is well to mix but little at a time, as it hardens very quickly. (‘Journal of Applied Chemistry.’)
Cement, Wa′terproof. Several compounds of this class have been already noticed. The celebrated “waterproof cement of Dihl” consists of porcelain clay or pipeclay, dried by a gentle heat, and powdered, mixed up to the consistence of a paste with boiled linseed oil, and, sometimes, a little oil of turpentine. It is coloured by adding a little red or yellow ochre, or any similar pigment. It is used to cover the fronts of buildings, roofs of verandahs, &c.