Science Abstracts, Volume 3Institution of Electrical Engineers., 1900 - Electric engineering |
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Abstract acid alternating current aluminium ampere hours amperes anode apparatus armature battery boilers cable carbon cell cent charge Chem chloride circuit coil Comptes Rendus condenser conductor connected constant copper curve cylinder density described determined diameter dielectric constant direct current discharge dynamo Écl effect electric electrodes electrolyte electromotive force Elektrotechn energy equation experiments formula galvanometer gases given gives heat hydrogen hysteresis inches increase induction insulated ions iron Journ kathode rays lamps light liquid load magnetic field maximum measured mercury metal method mixture motor obtained Phys plate platinum poles potential pressure produced radiation radium resistance rotary converters rotation salts self-induction solution spark speed station steam surface temperature theory three-phase transformer tube vacuum tube vapour varying velocity vibrations voltage volts water-tube boilers wattmeter wave wave-length weight wire World and Engineer Zeitschr
Popular passages
Page 743 - ... with the glass, the mass becomes optically homogeneous, and therefore transparent. In consequence, however, of the different dispersive powers of the two substances, the adjustment is good for one part only of the spectrum, other parts being scattered in transmission much as if no liquid were employed, though, of course, in a less degree. The consequence is that a small source of light, backed preferably by a dark ground, is seen in its natural outlines but strongly coloured. The colour depends...
Page 240 - ... tank. In this bath comparisons of the two principal platinum thermometers with the gas-thermometer were made up to 460°; and with a third thermometer, which was provided with a porcelain tube, we were able to go up to 590°. Comparisons of the platinum and gas-scales were carried out at over 150 different points, each comparison consisting of either ten or twenty readings of the different instruments. By the intermediary of the platinum thermometers a determination of the boiling-point of sulphur...
Page 240 - The present paper is the outcome of the co-operation of the Kew Observatory Committee and the authorities of the International Bureau of Weights and Measures at Sevres, for the purpose of carrying out a comparison of some platinum thermometers with the recognised international standards. A new resistance-box, designed for...
Page 583 - ... .and that even when the most favourable conditions are selected, and the intensity of current and the length of the arc are maintained constant, it is difficult to obtain consistent results, variations of over 5 per cent, being by no means unfrequent. The crater of the arc does not, therefore, possess the qualities required of a standard. Incidentally the experiments made confirm the theory that the crater of the arc is at the temperature of volatilization of carbon.
Page 501 - London has grown to such an extent that it has been found necessary to increase the generating plant, and also to provide for further large extensions in the future.
Page 451 - From a preliminary report read before the American section of the International Association for Testing Materials.) The authors briefly review the early experiments, and the more recent experiments of Kirkaldy and Le Chatelier. They then describe some slow tension-tests and tests in longitudinal shock made at Purdue University during the past two years on iron and steel wires from £ inch to £ inch diameter, ranging in length from 4 feet to 9 feet. The machine used is of a type in which the hammer...
Page 715 - ... result of rapid wear in service. The coarsely crystalline structure is found to be due to the presence of antimony in the alloy, but more frequently to the practice of rapid pouring at high temperatures. It is also caused by the presence in excess of deoxydising agents. The effects of crystallization upon the bearing are twofold. In the first place, increased local heating results owing to the varying degrees of hardness and heating capacity of the constituents, and secondly, the ductility and...
Page 522 - C. to 97° or 98°, also makes the bands more diffuse, but does not increase their intensity. It seems to the author improbable that the metallic atoms should maintain such independence in combination as to have the same absorptions in such different compounds as chloride, nitrate and sulphate, and it is more probable that the common absorptions are due to common products of decomposition. These might be the metallic ions, but the facts that neither dilution nor rise of temperature...
Page 678 - ... Protopterus are necessarily very incomplete. I hope however to return to their breeding grounds next season to complete the study. On the Conductivity of Gases from an Arc and from Incandescent Metals. By JA MCCLELLAND, MA, Cavendish Laboratory. [Received 11 December 1899.] The first part of the following paper contains an account of experiments on the conductivity of gas through which an arc discharge has passed ; the second part refers to somewhat similar experiments on gas taken from the neighbourhood...
Page 187 - If the lens of the camera be covered the moment after a flash has occurred, the developed image will always come out bright, feebly or strongly according to circumstances. If, however, the plate be exposed after a flash has acted upon it, either to the continued action of a feeble diffused light or to the powerful glare arising from one or more subsequent flashes, then on development the image of the original flash will probably come out black. The effect is therefore not a meteorological or physical...