Philosophical MagazineTaylor & Francis., 1876 - Physics |
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Common terms and phrases
action æther alteration apparatus appears atmosphere battery beat-notes beats body calcite carbonic acid centims chemical chloride coefficient coil colours conductor constant crust cryogen cryohydrate crystals deflection diameter direction disk duplex effect electricity electrodes electromotive force electroscope energy equal equation experiments expression formula friction gallium galvanic galvanometer give glass tube green grms heat hypothesis increase intensity intervals light liquid magnetism magnetometer mass means millims mineral mixture molecules motion needle notes observed obtained okenite paper particles Phil plates platinum polarization poles pressure produced proportional quantity ratio received current residual resistance rocks roller salts saponite selenium side-tube sodium solidifies solution spectrum Sprengel pump square substance sulphur suppose surface telegraphy tellurium temperature theory theory of colours tion tremolite vapour velocity vibrations violet vis viva volcanic Wheatstone's bridge wire
Popular passages
Page 174 - From the evidence it would appear that the submergence took place at the end of the fourteenth or the beginning of the fifteenth century.
Page 124 - ... number of particles, each capable of vibrating in perfect unison with every possible undulation, it becomes necessary to suppose the number limited ; for instance, to the three principal colours, red, yellow, and blue...
Page 126 - ... light. The line B, between red and green, in a certain position of the prism, is perfectly distinct; so also are D and E, the two limits of violet. But C, the limit of green and blue, is not so clearly marked as the rest ; and there are also, on each side of this limit, other distinct dark lines, / and g, either of which, in an imperfect experiment, might be mistaken for the boundary of these colours.
Page 154 - ... great importance and high interest — La Place's Coefficients and Functions and the calculation of the Figure of the Earth by means of his remarkable analysis. No student of the higher branches of Physical Astronomy should be ignorant of La Place's analysis and its result — "a calculus," says Airy, "the most singular in its nature and the most powerful in its application that has ever appeared.
Page 122 - And since the vibrations which make blue and violet are supposed shorter than those which make red and yellow, they must be reflected at a less thickness of the plate ; which is sufficient to explicate all the ordinary phenomena of those plates or bubbles, and also of all natural bodies whose parts are like so many fragments of such plates. These seem to be most plain, genuine, and necessary conditions of this hypothesis.
Page 82 - It is remarkable, however, that the same packing, when an apparatus specially constructed for the purpose of forged iron was filled with mercury, always yielded, even at a pressure of 40 atmospheres, in the course of a few days. It is with regret that I am still obliged to give the pressures in atmospheres as indicated by an air- or hydrogen-manometer, without attempting for the present to apply the corrections required to reduce them to true pressures. The...
Page 267 - This consists of four arms, suspended on a steel point resting on a cup, so that it is capable of revolving horizontally. To the extremity of each arm is fastened a thin disc of pith, lamp-blacked on one side, the black surfaces facing the same way. The whole is enclosed in a glass globe, which is then exhausted to the highest attainable point and hermetically sealed.
Page 121 - That fundamental supposition is, that the parts of bodies, when briskly agitated. do excite vibrations in the ether, which are propagated every way from those bodies in straight lines, and cause a sensation of light by beating and dashing against the bottom of the eye, something after the manner that vibrations in the air cause a sensation of sound by beating against the organs of hearing.
Page 82 - I have made is in the method of ascertaining the original volumes of the gases before compression, which can now be known with much less labour and greater accuracy than by the method I formerly described. The lower ends of the glass tubes containing the gases dip into small mercurial reservoirs formed of thin glass tubes, which rest on ledges within the apparatus. This arrangement has prevented many failures in screwing up the apparatus, and has given more precision to the measurements. A great...
Page 277 - A2 can bo neglected, it is impossible to satisfy the condition of a free surface for a stationary long wave — which is the same as saying that it is impossible for a long wave of finite height to be propagated in still water without change of type.