The Electrical Review, Volume 7

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Electrical review, Limited, 1879 - Electrical engineering
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Page 5 - But when the exhaustion is carried to so high a point that the molecules are sufficiently few, and the mean length of path between their successive collisions is comparable with the dimensions of the vessel, the...
Page 5 - The extra velocity with which the molecules rebound from the excited negative pole keep back the more slowly moving molecules which are advancing towards that pole. The conflict occurs at the boundary of the dark space, where the luminous margin bears witness to the energy of the discharge.
Page 277 - The power of conceiving of a substance different from that of matter is still beyond the limits of human intelligence, and the physical or objective conditions which are the concomitants of thought are the only ones of which it is possible to know anything, and the only ones whose study is of value. We are not, however, on that account forced to the conclusion that there is nothing in the universe but matter and force. The simplest physical law is absolutely inconceivable by the highest of the brutes,...
Page 277 - ... no conceivable analogy ; and the obvious and continuous path which we have hitherto followed up in our reasonings from the phenomena of lifeless matter through those of living matter here comes suddenly to an end. The chasm between unconscious life and thought is deep and impassable, and no transitional phenomena can be found by which, as by a bridge, we may span it over...
Page 320 - ... electric current, the cracks will be so enlarged as to be seen with the naked eye ; the wire, under the microscope, pre.sents a shrunken appearance, and is full of deep cracks. If the current is continued for several hours these effects will so increase that the wire will fall to pieces. This disintegration has been noticed in platina long subjected to the action of a flame by Prof.
Page 190 - ... distinct series of sounds from the telephone, which correspond with the movements of the pulse. When all is neatly adjusted, the sounds heard are three in number, •one long sound and two short, corresponding to the systolic push, the arterial recoil, and the valvular check. The sounds are singular, as resembling the two words,
Page 4 - ... forms an irregular ellipsoid drawn in towards the focal point. Inside the luminous boundary a focus of dark violet light can be seen converging, and, as the rays diverge on the other side of the focus, spreading beyond the margin of the dark space ; the whole appearance being strikingly similar to the rays of the sun reflected from a concave mirror through a foggy atmosphere. Green Phosphorescent Light of Molecular Impact. At very high exhaustions the dark space becomes so large that it fills...
Page 181 - I metre from each other, so that no disturbing cause should exist from their proximity. The two primary coils are joined in series to the battery, the circuit also passing through the microphone. In place of the telephone I have sometimes used a magnetic pendulum, the swing or the arc described indicating and measuring the forces.
Page 81 - C" and C' we may put that is to say, small variations of current will be proportional to the variation in the temperature of the strip. In order to facilitate the process of determining the value of a diagram in webers or other units of current, it is only necessary, if the variations are not excessive, to average the ordinates, and to determine their value by equation (1), or from a table prepared for that purpose. The error committed in taking the average ordinate instead of the absolute ordinates...
Page 320 - I have developed some striking phenomena arising from the heating of metals by flames and by the electric current, especially wires of platinum and platinum alloyed with iridium. These experiments are still in progress. " The first fact observed was that platinum lost weight when heated in a flame of hydrogen, that the metal...

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