The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1890 |
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Common terms and phrases
acid æther angle atmosphere atoms axis bolometer cadmium calculated camphor centim centre circuit coefficient coil constant corresponding curve deflexion density determined Devonian diameter direction discharge displacement distance effect electric electrified electrodes electromotive force energy equal equation error experiments Fleet Street galvanometer GEORGE FRANCIS FITZGERALD give given glass heat hydrogen hysteresis inch increase induction isometrics length light lines liquid Lord Rayleigh magnetic force means measured metals method millim millimetre mirror molecular molecular magnets molecules motion needle negative observed obtained oscillations paper Phil Philosophical Magazine piezometer plane plate position potential pressure produced Prof proportional quantity quartz ratio Red Lion Court rotation scale self-induction spark spectra spectrum substance surface Table TAYLOR and FRANCIS temperature tension theory thread tion tube velocity vibration volume wave-length waves weight wire zero zinc
Popular passages
Page 258 - Fahr., which is what we should have to produce to gain it by our usual processes. That it is, however, not necessarily impossible, we may infer from the fact that we can by a known physical process produce a still more brilliant light without sensible heat, where we are yet sure that the temperature exceeds this. No sensible heat accompanies the fire-fly's light, any more than need accompany that of the Geissler tube, but this might be the case in either instance, even though heat were there, owing...
Page 458 - I am aware hitherto unnoticed, that according to this hypothesis Neumann's triangle is necessarily imaginary, that one of three fluids will always spread upon the interface of the other two. Another point of importance may be easily illustrated by this theory, viz. the dependency of capillarity upon abruptness of transition. " The reason why the capillary force should disappear when the transition between two liquids is sufficiently gradual will now be evident. Suppose that the transition from 0...
Page 456 - The work required to cleave asunder the parts of the first fluid which lie on the two sides of an ideal plane passing through the interior, is per unit of area 2Ti, and the free surface produced is two units in area.
Page 117 - On the Relation of the Westleton Beds or ' Pebbly Sands ' of Suffolk to those of Norfolk, and on their extension inland, with some observations on the Period of the final Elevation and Denudation of the Weald and of the Thames Valley."— Part II.
Page 257 - ... the small amount of heat directly concerned in the making of the light itself, but a new indirect expenditure in the production of invisible calorific rays. Our eyes recognize heat mainly as it is conveyed in certain rapid ethereal vibrations associated with high temperatures...
Page 196 - President, in the Chair. The following communications were read : — 1. "On some Devonian and Silurian Ostracoda from North America, France, and the Bosphorus.
Page 31 - B are equal and opposite, the axes of the pendant pulleys and the attached weights remain at rest. In the electrical analogue the rotatory velocity of A corresponds to a current in a primary circuit, that of B to a current in a secondary. If, when all is at rest, the rotation of A be suddenly started, by force applied at the handle or otherwise, the inertia of the masses E, F opposes their sudden movement, and the consequence is that the pulley B turns tiitwards, if in the opposite direction to the...
Page 193 - ... Champernowne, and refers particularly to the area north of the Dart and east of Dartmoor. Owing to the complicated stratigraphy of the region, we have to fall back upon such information as can be procured of the general types of Upper, Middle, and Lower Devonian faunas ; for though the lithological constituents of these three divisions are broadly distinguishable, there are no definite lithological boundaries between them. The Lower Devonian is mainly distinguished by the occurrence of sandstone...
Page 192 - The buried fragments of a great ancient valley and river, and its tributaries, are connected with submerged channels in Lake Huron and Lake Ontario, thus forming the course of the ancient St. Lawrence (Laurentian) river, with a great tributary from the Erie basin and another across the southern part of the State of Michigan. This valley is of high antiquity, and was formed during times of high continental elevation, culminating not long before the Pleistocene period. The glaciation of the region...
Page 270 - To give an idea of the amount of heat at our disposition for experiment, and of the actual minuteness of the radiation which proceeds from even the most luminous tropical insect, we may say that if that rate of radiation from a lamp-black surface 1 square cm.