Text-book on Chemistry: For the Use of Schools and Colleges

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Harper, 1852 - 408 Seiten
 

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Seite 133 - The strength of the current is equal to the electro-motive force divided by the resistance...
Seite 299 - ... will prevent the metal from running away, and in a few minutes it will cool and take the impression, without the slightest injury to the paper from which it was taken.
Seite 361 - It is sparingly soluble in cold water, but much more so in hot, and is one of the most splendid compounds known.
Seite 337 - It is soluble in water and alcohol, but not in ether; and from it xanthic acid may be procured by the action of dilute hydrochloric acid.
Seite 155 - The general rule being to multiply the specific gravities of the simple gases or vapours respectively by the volumes in which they combine, to add those products together, and then to divide the sum by the number of volumes of the compound gas produced. By the application of this principle, we may often decide with great probability on the specific gravity which certain bodies should have in the state of vapour, although it has not been as yet possible to weigh their vapours experimentally. Thus,...
Seite 21 - ... gradually till the freezing point of water is reached, which is 32 deg. Fahrenheit. The water in the tube will gradually contract, obedient to the great law, until it reaches the temperature of 37 J deg. Fahrenheit, and then, instead of still contracting, as every other liquid in the world would have done, it begins to expand, and continues to do so until it reaches the freezing point and turns to ice. Thus we see that at the temperature of 37} deg. the water occupied the smallest possible space,...
Seite 150 - O, the latter formula implying that one of the atoms of oxygen is held by a feebler affinity than the other two. When a large figure, or coefficient, is placed on the same line as the symbol, and to the left of it, it multiplies that symbol as far as the first comma or + sign; or, if the formula be placed in a parenthesis, it multiplies every letter under the parenthesis; thus...
Seite 85 - Waves upon water pass round to the back of an object on which they impinge, and the undulations of light in the same manner flow round at the back of the piece of wire, ab, Fig.
Seite 86 - What has been said as regards the bright and dark stripes between e and x niight bo repeated for the space between e and y, •which also presents a similar alternation. That it is the interference of the light coming from the opposite sides of the opaque object which is the cause of these phenomena is proved by the fact that if we place an opaque screen on one side of it so as to prevent the light passing, all the fringes disappear.
Seite 82 - ... that can distinguish transverse sounds in the air. Lights differ from each other in two striking particulars — brilliancy and color. These are determined by certain affections or qualities in the waves. On the surface of water we may have a wave not an inch in altitude, or others, as the saying is, " mountains high." Under these circumstances waves are said to differ in amplitude, and transferring this illustration to the case of light, a wave the amplitude of which is great impresses us with...

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