Pneumatics: Embracing the Air-pump and the Diving-bellF. Warne and Company, 1873 - 98 páginas |
Otras ediciones - Ver todas
Pneumatics: Embracing the Air-Pump and the Diving-Bell John Henry Pepper Sin vista previa disponible - 2015 |
Pneumatics: Embracing the Air-Pump and the Diving-Bell John Henry Pepper Sin vista previa disponible - 2023 |
Términos y frases comunes
acoustic air-pump Argand burner atmosphere barometer bell bottle brass bucket Charles Wheatstone column of air condensed constructed current of air density diameter diver diving apparatus diving-bell edges elasticity equal experiments force fundamental note gamut give glass tube harmonic hear heard Heinke Heinke's holes human voice hydrogen intensity intervals length lever listen longitudinal vibrations major third Marloye means mercury monochord musical instruments musical interval musicians nodal points noise number of vibrations observed obtained octave ordinary organ-pipe pallets pass perfect perpendicular pipe piston placed plane plate plunger pneumatic Pneumatic Despatch pneumatic tube pressure pump raised receiver resonance rise sensitive flame shown solid sonometer sound produced sounding-board square Stonyhurst College stridulate string stroke surface syphon syren tion tone transverse tuning-fork unison vacuum valve velocity of sound ventral segments vessel vibratory motion violin waves weight whilst wind wing-cases yields
Pasajes populares
Página 73 - It was lively only for one or two days, and then its loud note could be heard from one end of the village to the other. When it died, he gave me the specimen, the only one I was able to procure. " It is a member of the family Locustida, a group intermediate between the crickets (Achelidn) and the grasshoppers (Acridiida).
Página 28 - B cannot get back again through the valve b, it will (as the bucket descends) raise the valve a, and so make its way through the upper part of the barrel d into the open air. But, upon raising the bucket G a second time, the air between it and the water in the lower pipe at...
Página 73 - In. the common field-cricket of Europe the male has been observed to place itself, in the evening, at the entrance of its burrow, and stridulate until a female approaches, when the louder notes are succeeded by a more subdued tone, whilst the successful musician caresses with his antennae the mate he has won. Any one who will take the trouble may observe a similar proceeding in the common house-cricket. The nature and object...
Página 90 - In intermediate positions — viz. when the vibrations are communicated obliquely to the surface — the sound will be found to have intermediate degrees of intensity. These facts, which the extensive investigations of Savart place in full evidence, being understood, the peculiarities of the sounding-boards of various musical instruments admit of easy explanation. The sounding-board of the piano-forte is better disposed than that of any other stringed instrument, as the planes of the vibrations of...
Página 11 - ... secured by brass frames screwed to the bell ; six of these lights being triangular, and in the crown, and six square, in the side. The bell is " suspended by a massive chain to a large swing crane, with a powerful crab, the windlass of which is grooved spirally ; the chain passes over four times into a well beneath, and to it are suspended the compensation weights," which, by acting upon the spiral shaft, accurately counterpoise the bell at all depths.
Página 29 - B, and the valve b (which arose by the ascent of the water through the box H when the plunger g was drawn up) falls down and stops the hole in H, the moment that the plunger is raised to its greatest height. Therefore, as the water between the plunger g and box H can neither get through the plunger upon its descent, nor back again into the -lower part of the pump...
Página 64 - The suddenness of the transition/ writes Wollaston, ' from perfect hearing to total want of perception, occasions a degree of surprise which renders an experiment of this kind with a series of small pipes, among several persons, rather amusing. It is curious to observe the change of feeling manifested by various individuals of the party in succession, as the sounds approach and pass the limits of their hearing. Those who enjoy a temporary triumph are often compelled...
Página 30 - F ; and the air has no way to ge\ out of the vessel but through the mouth of the pipe at I, and cannot get out when the mouth I is covered with water, and is more and more condensed as the water rises upon the pipe, the air then begins to act forcibly by its spring against the surface of the water at H; and this action drives the water up through the pipe...
Página 92 - ... rods with the velocity of about 18,000 feet per second, so that it would travel the distance of 200 miles in less than a minute. When sound is allowed to diffuse itself in all directions as from a centre, its intensity, according to theory, decreases as the square of the distance increases ; but if it be confined to one rectilinear direction, no diminution of intensity ought to take place. But this is on the supposition that the conducting-body possesses perfect homogeneity, and is uniform in...