Mechanical Contracting & Plumbing January-December 1908 . tion of the table and to allow a pin ateach side to fall after the inclined sur-face has passed. In this manner each. Open Mold. Showing Finished Pipe. October 1, 1908 PLUMBER AND STEAMFITTER CLEANING CEMENT FROM TILE. Cement is a silicate of lime, and assuch is far too hard to remove by ordin-ary scouring with sharp sand or otheruritty material. Consequently after atiled floor or wall lias been giouted, andit is neeessarj to remove the superfluouscement from the suiface the wall or flooris washed with muriatic acid. This acidis a volat
Mechanical Contracting & Plumbing January-December 1908 . tion of the table and to allow a pin ateach side to fall after the inclined sur-face has passed. In this manner each. Open Mold. Showing Finished Pipe. October 1, 1908 PLUMBER AND STEAMFITTER CLEANING CEMENT FROM TILE. Cement is a silicate of lime, and assuch is far too hard to remove by ordin-ary scouring with sharp sand or otheruritty material. Consequently after atiled floor or wall lias been giouted, andit is neeessarj to remove the superfluouscement from the suiface the wall or flooris washed with muriatic acid. This acidis a volatile gas dissolved in water. Itattacks the cement and forms a solublelime salt, which can be readily removedbv washing with ordinary water, wx-itesC. J. Fox. Muriatic acid, however, casts offfumes which in physical laboratories,fine dynamo rooms or other places con-taining delicate metal instruments, suchas galvano-meters, ohmmeters, etc., in-jures the metal by corrosion. In theseplaces dilute sulphunc acid may be is not volatile and consequently doesnot injure metal work. However, it doesnot form with the cement a soluble limesalt, but a phosphate of lime, whic
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