Articoli correlati a Lectures on select subjects in mechanics, hydrostatics,...
Lectures on select subjects in mechanics, hydrostatics, pneumatics, and optics with the use of the globes, the art of dialing, and the calculation of the mean times of new and full moone and eclipses - Brossura
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1764 Excerpt: ... the wire cage B over it, and cover the cage with a close receiver. Then, exhaust the air out of the receiver, and the air that was corked up in the phial will-will break the phial outwards by the force of its spring, because there is no air left on the outside of the phial to act against the air within it. 22. Put a shrivelled apple under a close receiver, and exhaust the air; then the spring of the air within the apple will plump it out, so as to cause all the wrinkles disappear j but upon letting the air into the receiver again, to press upon the apple, it will instantly return to its former decayed and slirivelled state. 23. Take a fresh gg, and cut off a little of the shell and film from its smallest end, then put the egg under a receiver, and pump out the air; upon which, all the contents in the egg will be forced out into the receiver, by the expansion of a small bubble of air contained in the great end, between the shell and film. 24. Put some warm beer in a glass, and having set it on the pump, cover it with a close receiver, and then exhaust the air. Whilst this is doing, and thereby the pressure more and more taken off from the beer in the glass, the air therein will expand itself, and rise up in innumerable bubbles to the surface of the beer; and from thence it will be taken away with the other air in the receiver. When the receiver is near exhausted, the air in the beer, which could not disentangle itself quick enough to get off with the rest, will now expand itself so, as to cause the beer to have all the appearance of boiling; and the greatest part of it will go over the glass. 2 5. Put some warm water in a glass, and put a bit of dry wainscot or other wood into the water. Then, cover the glass with a close receiver, and exhaust the air; upon...
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