The practical electroplater A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions . fore the tinning solution is applied the shells shouldbe examined, and if any holes appear dry blacklead shouldbe rubbed in on the face by means of a soft brush, or thebacking pan may be rubbed with a mixture of half oil andblacklead before the shells are tinned. Either of thesemethods will prevent the backing metal from comingthrough the holes in the shells. Tinning the Shells. The next operation is tinning the shells, and is per-formed by laying s
The practical electroplater A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions . fore the tinning solution is applied the shells shouldbe examined, and if any holes appear dry blacklead shouldbe rubbed in on the face by means of a soft brush, or thebacking pan may be rubbed with a mixture of half oil andblacklead before the shells are tinned. Either of thesemethods will prevent the backing metal from comingthrough the holes in the shells. Tinning the Shells. The next operation is tinning the shells, and is per-formed by laying sufficient shells face down to cover a levelboard cut to the inside measure of the backing pan. After the shells are laid on the board, the workman,with a moderately stiff brush, rubs the tinning solution wellinto the cavities and over the back of the shells, after 242 THE PRACTICAL ELECTROPLATER. which they are held on edge over the jar to drain off anyexcess of the solution. Sufficient tin foil to fully cover the back of the shellsis then laid thereon, after which they are immediatelyplaced in the previously heated backing pan. It is abso-. Mold Brush. lutely necessary that the pan should have a smooth andlevel surface, and should always be kept in that condition,as any irregularities on the surface of the pan will assertthemselves on the face of the shell in the backing pan containing the tinned shells is then placed onthe molten metal in the casting pot. The temperature of TINNING THE SHELLS. 243 the metal should be kept uniform, and heated sufficiently tocolor a dry white paper dark brown. Do not overheat the metal, as the tin is liable to burnand form as dross on the surface of the pot. If the metalbecomes too hot it will distort the shells, causing extralabor in finishing the plates. When the pan has attained the same heat as the moltenmetal, the tin foil melts and amalgamates with the coppershells. Particular attention should be paid to pouring the moltenmeta
Size: 999px × 2503px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisheretcetc, bookyear189
