The performance of aircraft engines under the conditions of low pressure and temperature encountered in flight was determined with this equipment. The chambers were of heavy monolithic concrete construction and were equipped with refrigerating machinery and vacuum pumps or large capacity. The dynamometers for the absorption and measurement of the power developed were mounted outside the chamber, as were all other necessary apparatus and engine controls. One of the new chambers (after this

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Photo credit: © Aclosund Historic / Alamy / Afripics
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Keywords: 1914-1918--aerial, 980604--7726d-002, air, america, archive, armed, army, bureau, collections, defence, force, forces, military, national, navy, operations--research--photograph, reportage, service, serviceman, servicemen, soldier, standards--history--photograph, states, united, usa, war, world