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ANALYTICAL CHEMISTRYently removed from the motor and weighed before and after a run to determine the amount of material charged. Aluminum and Lucite were favored in the construction to reduce the tare weight.This work waa performed with the aid of U. 8. Navy funds under Subcontract 1, Contract NOrd 10431, a prime contract with the Hercules Powder Company, Allegany Ballistics Laboratory.as the solution in A decreases; thus, overheating of the dry residue is avoided. Moreover, if evaporation at a low temperature is desired, dry ice and acetone can be placed in / and a high vacuum can be supplied with an oil pump. The apparatus then becomes a convenient freeze-dry assembly.

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