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Page 209 - Spodumene (an aluminium and lithium silicate) phosphoresces very brilliantly with a rich golden yellow colour, but shows no spectrum line, only a strong concentration of light in the orange and yellow. A phosphorescing crystal of Spodumene has all the internal light cut off with a Nicol prism, when the long axes of the Nicol and the crystal are parallel. It became of interest to see if the other earths would show phosphorescent properties similar to those of alumina, and especially if any of them...
Page 56 - On the Structure and Affinities of the Genus Monticulipora and its Sub-Genera, with Critical Descriptions of Illustrative Species. Illustrated with numerous Engravings on wood and lithographed Plates. Super-royal 8vo, 18s.
Page 186 - Among those tried, the anemometers with the larger cups registered the most wind, or in other words required the lowest factors to give a correct result. 3. That with the large Kew pattern, which is the one adopted by the Meteorological Office, the register gives about 120 per cent, of the truth, requiring a factor of about 2'5, instead of 3. Even 2'5 is probably a little too high, as friction would be introduced by the centrifugal force, beyond what occurs in the normal use of the instrument. 4....
Page 207 - 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 wave-length of this red line, which appears characteristic of this form of alumina, is, as near as I can measure, X 689'5 mmm This line coincides with the one described by E.
Page 184 - W* for the square of mean W. The former is necessarily greater than the latter ; but how much, we cannot tell without knowing the actual variations. We should probably make an outside estimate of the effect of the variations, if we supposed the velocity of the wind twice the mean velocity during half the duration of the experiment, and nothing at all during the remainder. On this supposition, the mean of W3 would be twice the square of mean W, and the correction for the wind would be doubled.
Page 187 - The problem of the anemometer may be stated to be as follows : — Let a uniform wind with velocity V act on a cup anemometer of given pattern, causing the cups to revolve with a velocity v, referred to the...
Page 226 - ... in Angstrom's normal solar spectrum, while the lithium line appears to be unrepresented. In the case of iron, which gives such a multitude of lines, it was a priori probable that some lines would be coincident, or nearly so, with lines of other elements ; and in fact we find that in five-sixths of the supposed coincidences lines of iron are involved. We have, therefore, chiefly directed our attention to iron lines. A complete account of the separate resolutions will be found in the ' Proceedings...
Page 183 - MK, must intersect the axis of the shaft in the same point, which is the condition to be satisfied in order that the ball may roll without rubbing, even though impelled laterally by a force sufficient to cause the side of the shaft to bear on it. The size of the balls and the inclinations of the surfaces admit of considerable latitude subject to the above condition. The arrangement might suitably be chosen something like that in the figure. It seems to me that a ring of balls constructed on the above...
Page 199 - ... the increase of the continuous spectrum seemed to overpower them. When nitrogen was substituted for hydrogen, the strongest lines of the green flutings were seen when the spark without jar was first passed at atmospheric pressure, probably from hydrogen occluded, as it usually is, in the magnesium electrodes. As the pressure was increased they speedily disappeared entirely, and were not again seen either at high or low pressures. With carbonic oxide the same thing occurred as with nitrogen ;...