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The traps employed in the washing rooms should be of the best possible design and material, and proof against the evil known as "siphoning." The gullies above them are best placed adjoining one of the ventilators in the walls, at the floor level, as then a current of air sweeps over them and up the extraction flues.
It grew denser as he came nearer. He found Bob Hart, in oilskins and rubber boots, bossing a gang of scrapers, giving directions to a second one building a dam across a draw, and supervising a third group engaged in siphoning crude oil from one sump to another. From head to foot Hart and his assistants were wet to the skin with the black crude oil. "'Lo, Dave! One sure-enough little spouter!"
There was not a drop of gas in it. He lifted up the hood and looked inside at the motor. Whatever he saw there, he said nothing. Finally, by siphoning some gas from Snedden's tank and making some adjustments, he seemed to have the car in a condition again for it to run. He was just about to start it when MacLeod returned, carrying a canary-bird in a cage. "I've telephoned to town," he announced.
The pressure is supplied merely by a stream of running water, and the periodical silence of the birds is due to the fact that this pressure is relieved through the automatic siphoning off of the water when it reaches a certain height. The action of the siphon, it may be added, is correctly explained by Hero as due to the greater weight of the water in the longer arm of the bent tube.
This procedure, in turn, would set up a siphoning action through a central tube in effect, creating a small but powerful water-jet motor. "We'll be human submarines!" Bud exclaimed. By the time Bud left the laboratory half an hour later, Tom had already plunged into work on his newest invention. The idea was simple enough in itself, Tom felt.
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