Philosophical Transactions, Giving Some Account of the Present Undertakings, Studies, and Labours of the Ingenious, in Many Considerable Parts of the World

Front Cover
C. Davis, Printer to the Royal Society of London, 1880 - Science
0 Reviews

What people are saying - Write a review

We haven't found any reviews in the usual places.

Other editions - View all

Common terms and phrases

Popular passages

Page 532 - As we look at the whole series of changes from the remote past, the ellipticity of figure of the earth must have been continually diminishing, and thus the Polar regions must have been ever rising and the equatorial ones falling ; but, as the ocean always followed these changes, they might quite well have left no geological traces. "The tides must have been very much more frequent and larger, and accordingly the rate of oceanic denudation much accelerated. " The more rapid alternation of day and...
Page 658 - There is a faint continuous spectrum ending in the red somewhere near the line B ; then a black space, and next an intensely brilliant and sharp red line, to which nearly the whole of the intensity of the coloured glow is due. The wavelength of this red line, which appears characteristic of this form of alumina is, as near as I can measuie, \ 68g'5 mmm This line coincides with the one described by E.
Page 528 - ... exceed the true retardation of the real disturbed moon, and the difference between these two will give an apparent acceleration. It is thus possible to give an equation connecting the apparent acceleration of the moon's motion and the heights and retardations of the several bodily tides in the earth. There is at the present time an unexplained secular acceleration of the moon of about 4" per century, and therefore if we attribute the whole of this to the action of the bodily tides in the earth,...
Page 464 - The precession of a fluid spheroid is the same as tliat of a rigid one which has an ellipticity equal to that due to the rotation of the spheroid. From this it follows that the precession of a fluid spheroid will differ by little from that of a rigid one of the same ellipticity, if the additional ellipticity due to the non-periodic part of the tide-generating...
Page 772 - ... disturbance is a function of the time, while at any instant the displacement at a point is a function of the position of the point. Any physical quantity that has the same relationship to some independent variable (usually time) that a propagated disturbance has, at a particular instant, with respect to space, may be called a wave.
Page 658 - Diamonds from other localities emit bright blue, apricot, pale blue, red, yellowish-green, orange, and pale green light. The most phosphorescent diamonds are those which are fluorescent in the sun. One beautiful green diamond in my collection, when phosphorescing in a good vacuum, gives almost as much light as a candle, and you can easily read by its rays. The light is pale green, tending to white.
Page 587 - The theoretical directions of coast line are not so well marked in parts removed from the equator. The great line of coast running from North Africa by Spain to Norway has a decidedly north-easterly bearing, and the long Chinese coast exhibits a similar tendency. The same may be...
Page 587 - ... of greatest pressure. In the case of the earth, the wrinkles would run north and south at the equator, and would bear away to the eastward in northerly and southerly latitudes, so that at the north pole the trend would be north-east, and at the south pole north-west. Also the intensity of the wrinkling force varies as the square of the cosine of the latitude, and is thus greatest at the equator and zero at the poles. Any wrinkle, when once formed, would have a tendency to turn slightly, wo as...
Page 657 - It was now possible to heat the glass to dull redness without hydrogen coming in the tube ; but as soon as the heat approached the fusing point the characteristic lines appeared. It was found that however highly I heated the glass and then pumped the tube free from hydrogen, I had only to heat the glass to a still higher temperature to get a hydrogen spectrum in the tube. I consider the hydrogen comes from vapour of water, which is obstinately held in the superficial pores, and which is not entirely...
Page 639 - Contributions to Molecular Physics in High Vacua," comprising, " Magnetic Deflection of Molecular Trajectory," " Laws of Magnetic Rotation in High and Low Vacua," and" Phosphorogenic properties of Molecular Discharge " was published in the " Philosophical Transactions of the Royal Society.

Bibliographic information