. The principles and practice of dental surgery. llers, however,should be brought a little nearer to each other every time theplate is passed between them, and during this process they shouldbe kept well oiled, so that there may be as little friction as pos-ble. Many roll the ingot without any previous hammering. Inthe process of rolling, care must be had to anneal often and to rollin one direction until sufficient width of plate is obtained; then,before cross-rolling, be sure to anneal, else the plate will bevery apt to crack. Rolling-mills for gold are variously constructed. Some arevery sim
. The principles and practice of dental surgery. llers, however,should be brought a little nearer to each other every time theplate is passed between them, and during this process they shouldbe kept well oiled, so that there may be as little friction as pos-ble. Many roll the ingot without any previous hammering. Inthe process of rolling, care must be had to anneal often and to rollin one direction until sufficient width of plate is obtained; then,before cross-rolling, be sure to anneal, else the plate will bevery apt to crack. Rolling-mills for gold are variously constructed. Some arevery simple, while others are quite complex, having a great dealof machinery connected with them. The rollers also vary inlength, from three to five inches. For the gold plate used bydentists, they need not be more than three or three and a halfinches long. Fig. 182 represents a simple form of rolling-mill,without the cog-gearing, as seen in Fig. 183. The latter is astrong but simple mill, and is very well suited to the dental labo- FiG. 182. Fig.
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