nsists of two parts. A series of direct- expansion ammonia coils mounted on top of the chamber is pro- vided for cooling the carburetor air. These coils consist of about 2,000 feet of liriach piping inclosed in a box insulated with 4 inches of sawdust. The air is made to pass through this coil box… … directly to the carburetor, thus supplying cold air to the intake when desired. The second part of the cooling system consists of about 800 feet of ammonia expansion coils mounted in the left end of the test chamber as shown in the sectional diagram, figure 2. Four fans are furnished to force air…
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