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Scientific American, Vol. 44, No. 8 (February 1881) (1881)

leaf 7

An illustration from Scientific American, Vol. 44, No. 8 (February 1881), 1881, leaf 7
out of the solid piece it would of 2\± pounds of wheat flour, 2 tablespoonfuls of powdered expanded air is then delivered through a pipe into the room rosin, and 2 tablespoonfuls of powdered alum; rub the mix- be 20s. Among other specimens exhibited to our correspon- to be cooled. About fifty per… … IMPROVED AIR REFRIGERATING MACHINE. cylinder, the difference being made up by the engine. I ivory was of one piece, would be worth 3s. 6d. The firm paste; transfer this to a small kettle over a fire, and stir un- 'can supply the complete knife and fork for 4s. 3d., with The machine is but one of…

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