Word: compressors
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...generated by a stream of gas varies with the stream's diameter. The big stream that shoots from the tailpipe of a jet engine stirs up a lot of low-frequency sound that carries for miles as a thunderous roar. Small gas streams, e.g., air escaping from a compressor hose, give high-frequency sound. Much of it is too high-pitched to be heard at all, and much of the rest is absorbed by the air before it has traveled...
...bypass engine is an intermediate type that stands midway between the turbojet and the turboprop. It has two compressors, each driven by its own turbine through its own shaft (see diagram). Some modern turbojets have this arrangement too, but all the air that is compressed passes through the combustion chambers to form the high-speed jet. In the bypass engine, part of the air from the forward compressor flows around the combustion chambers (incidentally cooling trie engine's skin) and mixes with the speeding gas in the tailpipe. It cools the stream and slows it, but adds greatly...
...victim of economy and the machine age yesterday, as 17 maids left their posts for the last time. A skeleton crew of two remains to clean House offices, common rooms and the libraries, but students will face the student porters next Monday. The eightman crew, armed with compressor tanks and detergent, will scour bathrooms, bedrooms, and studies weekly...
...this the do-it-yourself addict also adds a paint spray gun with an attached air compressor for $60, an exhaust fan to carry off the fumes for $20, plus a $200 collection of chisels, wrenches, hammers, screw drivers, vises and pliers. For outdoor work he buys a $125 power lawn mower, a $35 hedge trimmer, a $115 chain saw for work on his trees, a $250 tractor to plow his garden and shovel snow from his driveway. By the time he is finished, he has as much as $2,000 invested in his new hobby, and he can build...
...moving parts, only a cylindrical stock of rings behind the end of the tailpipe. In normal flight, the gases pass through the center of the rings. When the pilot wants to stop quickly on landing, he opens a valve, and a blast of air from the engine's compressor shoots down a pipe running through the tailpipe and is released at about right angles into the center of the stream of gases. This diverts the gases into an expanding cone and makes them hit the rings, which are shaped to catch them and reverse their direction. Aerojet says that...