Elementary Physics: An Introduction to the Study of Natural PhilosophyReeve and Benham, 1851 - 486 pages |
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Page 32
... magnetic poles , and exhibits lines of varying intensity of attractive energy over its large surface , so may the little unit of matter have a polar disposition , and , in obedience to this , the tendency of the other atoms to adhere ...
... magnetic poles , and exhibits lines of varying intensity of attractive energy over its large surface , so may the little unit of matter have a polar disposition , and , in obedience to this , the tendency of the other atoms to adhere ...
Page 239
... magnetic . We may prove , by very easy experiments , the power of machine electricity to induce magnetism . If we place a sewing - needle upon a piece of copper plate on the table of the universal discharger , and then send the charge ...
... magnetic . We may prove , by very easy experiments , the power of machine electricity to induce magnetism . If we place a sewing - needle upon a piece of copper plate on the table of the universal discharger , and then send the charge ...
Page 258
... magnetic power of the electro - chemical current . Calorific phenomena . - Heat is evolved whenever a vol- taic excitation is sent along a conducting body , the in- tensity of the heat being greatest when the plates are large ; and it ...
... magnetic power of the electro - chemical current . Calorific phenomena . - Heat is evolved whenever a vol- taic excitation is sent along a conducting body , the in- tensity of the heat being greatest when the plates are large ; and it ...
Page 266
... magnetic , from the same source . The power of communicating an electric shock depends entirely on the nervous system , for the heart may be taken out , and the fish flayed , without its losing the power ; but if the nerves are divided ...
... magnetic , from the same source . The power of communicating an electric shock depends entirely on the nervous system , for the heart may be taken out , and the fish flayed , without its losing the power ; but if the nerves are divided ...
Page 282
... magnet , M , is held near one of the vertical arms , attraction and repulsion will be detected , accord- ing to the direction of the current . are the most powerful thermo - electrics ; if two small bars are tied together at one end ...
... magnet , M , is held near one of the vertical arms , attraction and repulsion will be detected , accord- ing to the direction of the current . are the most powerful thermo - electrics ; if two small bars are tied together at one end ...
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Common terms and phrases
actinism angle appears arrangement atmosphere attraction ball battery Bismuth blue body caloric calorific carbonic acid centre chemical action chemical affinity colour column condensed conductor connected copper crown glass cylinder degree direction disc distance disturbance duced earth effects elasticity electric current electricity electroscope employed equal equilibrium excited exerted experiments fall feet fluid force galvanometer glass grains heat hydrogen inches increased influence intensity iron laws Leyden jar light liquid luminous magnetic mass matter mercury metal motion move needle nitric acid obtained oxygen particles passing phenomena piece placed planet plate platinum polarization poles portion pressure principle produced proved quantity radiations rays reflected refraction result shown side silver solar solid solution specific gravity spectrum substance sulphate sulphuric acid supposed surface temperature thermometer tion tricity tube undulations vapour velocity vessel vibrations voltaic waves weight yellow zinc دو
Popular passages
Page 367 - I had often, in the pride of half knowledge, smiled at the means frequently employed by gardeners, to protect tender plants from cold, as it appeared to me impossible, that a thin mat, or any such flimsy substance, could prevent them from attaining the temperature of the atmosphere, by which alone I thought them liable to be injured. But, when I had learned, that bodies on the surface of the earth become, during a still and serene night, colder than the atmosphere, by radiating their heat to the...
Page 405 - To the same degree of Refrangibility ever belongs the same colour, and to the same colour ever belongs the same degree of Refrangibility.
Page 405 - ... follows, that the orange and green rays of the spectrum, though they cannot be decomposed by prismatic refraction, can be decomposed by absorption, and actually consist of two different colours possessing the same degree of refrangibility.
Page 253 - ... the quantity of electrolyte decomposed, must be the equivalents of each other. The action in each cell, therefore, is not to increase the quantity set in motion in any one cell, but to aid in urging forward that quantity, the passing of which is consistent with the oxidation of its own zinc ; and in this way it exalts that peculiar property of the current which we endeavour to express by the term intensity, without increasing the quantity beyond that which is proportionate to the quantity of...
Page 406 - By absorbing the excess of any color at any point of the spectrum above what is necessary to form white light, we may actually cause white light to appear at that point, and this white light will possess the remarkable property of remaining white after any number of refractions, and of being decomposable only by absorption.
Page 320 - ... all those planets whose internal structure admits of such a difference. Yet, allowing all this, the main difficulty seems not to be overcome, but merely removed from the eyes to a greater distance ; for the question may still be asked, with equal justice, whence did the sun acquire its magnetic force ? And if from the sun we have recourse to a central sun, and from that again to a general magnetic direction throughout the universe, having the Milky Way for its equator, we but lengthen an unrestricted...
Page 201 - Now it is wonderful to observe how small a quantity of a compound body is decomposed by a certain portion of electricity. Let us, for instance, consider this and a few other points in relation to water. One grain of water, acidulated to facilitate conduction, will require an electric current to be continued for three minutes and three quarters of time to effect its decomposition, which current must be powerful enough to retain a platina wire T£T of an inch in thickness*, red hot, in the air during...
Page 406 - ... out of place here to detail, I conclude that the solar spectrum consists of three spectra of equal lengths, viz. a red spectrum, a yellow spectrum, and a blue spectrum. The primary red spectrum has its maximum of intensity about the middle of the red space in the solar spectrum, the primary yellow spectrum has its maximum in the middle of the yellow space, and the primary blue spectrum has its maximum between the blue and the indigo space. The two minima of each of the three primary spectra coincide...
Page 447 - These discoveries bear most strikingly upon all my experiments ; and, at the same time as they appear to confirm in a most satisfactory manner the conclusions to which my results have led me, they point to an order in the natural arrangement which is singularly interesting. In the spring, when seeds germinate and young vegetation awakes from the repose of winter, we find an excess of that principle which imparts the required stimulus ; in the summer, this exciting agent is counterbalanced by another...
Page 437 - Upon all those bodies on which liyht exerts a direct and determinate influence, aa upon the organized compounds, we find that the changes due to actinic power are but slightly interfered with, whereas upon all those inorganic bodies which undergo a change when exposed to the solar chemical radiations, that change being entirely due to actinism, light acts as a powerfully interfering agent. The conditions under which these antagonistic forces — light and actinism — operate upon each other are...