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according acid action alteration appears beats becomes body cause circuit colours condition consequently considerable considered consists constant containing continuous corresponding cryohydrate deflection determined direction disk distance double effect electricity employed energy equal equation evidence existence experiments expression fact force four function further given gives glass greater green heat increase intensity intervals known latter length less light liquid lower magnetism mass means measured method motion nature notes observed obtained original particles pass period plates polarization poles position possible powerful present pressure primary produced proportion quantity ratio received regard relation remains represented residual resistance respect rocks salt separate side solution spectrum square sufficient suppose surface Table taken temperature theory tion tube vary vibrations wave weight whole wire
第 174 頁 - From the evidence it would appear that the submergence took place at the end of the fourteenth or the beginning of the fifteenth century.
第 126 頁 - ... 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.
第 154 頁 - ... 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.
第 122 頁 - 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.
第 82 頁 - 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...
第 267 頁 - 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.
第 121 頁 - 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.
第 82 頁 - 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...