. Foundry practice; a treatise on molding and casting in their various details. Fig. 96. The sand blast machine is shown in Fig. 97 shows a pneumatic shaker mounted on atripod so that it may be placed wherever desired and may. Fig. 97. be fitted to hold a riddle, so that a riddle of any desirednumber may be placed in it. Fig. 98 represents a pneumatic hoist having a wind-ing drum driven by cylinders. 19° FOUNDRY PRACTICE

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