ies of doubly concave cavities. A straight molds, made in the box, A. Foundrymen and molders will next affirm that each twenty pounds is at an equal distance stick is inserted into the end of each piece, and the pith is understand the application of the device without further de- from the center… … different circles, as the radii are unequal. “Fig. 8 illustrates a method of casting grooved rolls, in- manufacture of floats and buoys for fishermen, and for the light sun hats worn in the east: but it is greatly inferior in But in removing one weight farther from the fulcrum than vented by R.-C.…
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