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Proceedings of the Institution of Electrical Engineers (Volume 15) (Paperback) Loot Price: R787
Discovery Miles 7 870
Proceedings of the Institution of Electrical Engineers (Volume 15) (Paperback): Institution of Electrical Engineers

Proceedings of the Institution of Electrical Engineers (Volume 15) (Paperback)

Institution of Electrical Engineers

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Loot Price R787 Discovery Miles 7 870 | Repayment Terms: R72 pm x 12*

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1887 Excerpt: ... 250 ABSTRACTS. LORD RAYLEIGH--ON PROFESSOR HIMSTEDT'S DETERMINATION OP THE OHM. (Phil. Mag., Vol. 21, No. 128, Jan., 1886, pp. 10-18.) The leading feature in the method of Professor Himstedt is the use of a commutator or separator, by which the make-and break--induced currents are dissociated, one or the other passing in a stream at equal small intervals of time through a galvanometer. The commutator makes contact by means of mercury cups, and Lord Rayleigh points out how very capricious and uncertain such contacts are in their action. A second point raised relates to the measurement by the galvanometer of a series of induced currents, each of short duration. In Himstedt's method the needle of the galvanometer stands in an oblique position, and we have to consider whether the axial magnetisation does not alter under the action of a force having a sensible axial component. There is yet a third point which may be open to objection, viz., the determination of K, the constant expressing the number of turns of the primary of the induction coil per unit of length. Apparently the value of K is arrived at by dividing the whole number of turns, 2,864, by the total measured length, 135-125 cm.; but in so doing it is assumed tacitly that the turns are all perfectly uniform, or that only the mean value is required, both of which assumptions may be questioned. Professor E. J. HOUSTON--PHOTOGRAPHY KY A LIGHTNING FLASH. (Journal FranhUn Inttitute, Vol. 91, No. 8, March, 1886, pp. 221-22.) The view taken was that of the surrounding country near Philadelphia at 7 p.m. on the 29th Oct., 1883. The night was excessively dark, with much wind and rain. The camera was placed at an open window, with the slide drawn, and immediately after the flash the slide was returned. The plate...


Imprint: General Books LLC
Country of origin: United States
Release date: February 2012
First published: February 2012
Authors: Institution of Electrical Engineers
Dimensions: 246 x 189 x 13mm (L x W x T)
Format: Paperback - Trade
Pages: 252
ISBN-13: 978-1-235-77628-1
Categories: Books
LSN: 1-235-77628-X
Barcode: 9781235776281

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