International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 439
eavierthan the small weight. Beforethe air is exhausted, each bodyis buoyed up by the weight ofthe air it displaces, and since the fig. 197. sphere displaces the most air, it loses more weight by reasonof this displacement than the small weight. Suppose thatthe volume of the sphere exceeds that of… … AIR COMPRESSORS. 1071. For many purposes compressed air is preferableto steam or other gas for use as a motive power. In suchcases air compressors are used to compress the air. Theseare made in many forms, but the most common one is toplace a cylinder, called the air cylinder^ in front of the…
Railroad engineering
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