Background
GRAY, Andrew was born in 1847 in Scotland. Son of John Gray, Lochgelly, Fifeshire.
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(Excerpt from Absolute Measurements: In Electricity and Ma...)
Excerpt from Absolute Measurements: In Electricity and Magnetism This little book was originally intended to be mainly a reprint of some papers on the Measurement of Electric Currents and Potentials in Absolute Measure contributed to Nature during the winter of 1882-3; but as these were being reprinted, many alterations and additions suggested themselves, which it was thought would render the book more generally useful. Most of the additional matter is mentioned in the introductory chapter, but I may here refer to a sketch of the theory of alternating machines, and of methods of measurement available in such cases, contained in Chapter X., and to Chapter XII. on the Dimensions of Units, which I have thought it desirable to introduce. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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(This historic book may have numerous typos and missing te...)
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. 1901 Excerpt: ... side branch with the space from which the water is to be drawn. The flow of the water along the constricted neck of T gives by Bernoulli's theorem a lower pressure at the constriction than at the part beyond, and there is consequently a flow of fluid from the space surrounding and behind the nozzle. The increasing pressure from the constricted part of T forwards is employed in retarding the fluid flowing into it. The pump may be employed of course to transfer one fluid from the spice by means of a jet of another fluid applied by P. In this case a mixture of the two fluids is delivered by T to the delivery pipe. We shall suppose that the average pressure of the fluid in the nozzle is pv in the surrounding pipe pv and in the delivery pipe p, while the densities of the fluids and their velocities are p,, p,, p, vlt i, v respectively, while the areas of delivery in the three cases are av ar a. The momentum carried in by the jet in unit of time is p,»,«., and the rate at which momentum is generated by the pressure is /,«, similarly in the other cases. The rate at which momentum is delivered by the jet and the surrounding pipe is therefore (pl + plv')al + (pt + p1vf)ur The momentum delivered per second across a cross-section of the delivery tube is (p + pv)a, and we have (Pt + P.VK + (f, + P.»ii = (P + P1)"-(51) Besides this we have the equation of continuity, namely, the condition that as much matter is delivered as flows from the two jets. This condition is iPii + lWi = ar,»-52) Of course the engineering student will understand that here and elsewhere, if pressure is measured in pounds per square foot or square inch, the p in the formula as written above is g (that is 82-2) times the pressure thus reckoned, and equation (iil) will...
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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. 1888 edition. Excerpt: ...the zero passage in the first of the second series divided by the number of semi-periods gives an average semi-period of vibration; in the same way the second semi-vibration of the first series and the second of the second series gives another average, and so on. A second set of averages can be Period, &c. obtained deduced from Suc-cessive Series of Observa-tions. from the second and third short series and the interval between them. Each successive set of average results (corrected if necessary for amplitude) gives a mean result, and these again a final mean period. In the same way the amplitudes may be dealt with and a mean logarithmic decrement found. The results of observations, and of different sets of observations, may be combined by rules derived from the theory of Least Squares so as to give the most probable values of the quantities sought, and we shall state and use such rules when necessary in what follows. We have not space here to enter into the subject. Section III. MEASUREMENT OF COUPLES. There are many electric and magnetic instruments in which an applied couple or system of couples is equilibrated by a reacting couple the moment of which therefore measures that of the former. This equilibrating couple may be obtained in various ways; for example, by the torsion of an elastic wire or thread; by means of a bifilar suspension; or by the deflection of a magnet in a magnetic field. We shall consider shortly the measurement of couples produced in the first two different ways, deferring the third until we deal with ignetic measurements. Rigidity defined. When a wire is twisted by turning one end round Definition the axis of the wire while the other end is held fixed, oi Twist. a resisting couple is set up by elastic reaction in every...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 edition. Excerpt: ...from the known data of the coil and thus R is found. In no practical case can nM be large, and therefore K must be Lord Ray small, and a difficulty arises on this account in the carrying out lelK" auii of the method. This was overcome in Lord Rayleigh and „. "?, Mrs. Sidgwick's experiments by arranging that the main current j1.' S should flow along AC (Fig. 131), through a resistance a small mens. Fig. 131. compared with the resistance e between A and B, while at the two points B and C, including a resistance 6 also small compared with a, the terminals connected with the revolving disk were applied. Thus b was the resistance which was evaluated by the experiment. The connections at A, B, C were made by means of mercury cups. The main current being y, and no current flowing in the circuit applied at BC, the current through A B C is yaja--b--c). Hence the difference of potential between B and C was yabj(a + b + c). This was therefore the electromotive force generated by the motion of the disk. It will be convenient to regard it as the difference of potential produced by the current y between the ends of a conductor of resistance abja + b-f-e). Arrango-The pair of coils used by Glazcbrook in his determination of nient of the ohm (see abovo, p. 543) were employed, and were at first Apjiara-placed close together with the disk between them, so as to give a maximum inductive effect The axle was mounted vertically in the frame already used for the spinning coil determinations. so that the arrangements then used for driving and measuring the speed were available also in the present case. The diameter of the disk was about-6 of that of the coil. This size was chosen as on the one hand it was not desirable to have any part of the...
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(Excerpt from The Theory and Practice of Absolute Measurem...)
Excerpt from The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Vol. 1 of 2 The present work is an extension of my small book which, published in 1884, has long been out of print. When the question of the issue of a second edition arose about three years ago, it was thought desirable to extend the plan of the former book so as to make the new a fairly complete treatise on the absolute measurement of electric and magnetic quantities. It has not been my aim to processes or a collection of practical rules, but one in which should be welded together, in some degree at least, the practice of absolute measurements and the mathematical theory of electric and magnetic phenomena. Thus it was no part of my plan to deal with the more recondite and abstract parts of electrical theory; but I trust the work now published may prove of some help to students who may wish to proceed to those subjects. I have, notably in Chapter I. of the present volume, included here and there for the sake of illustration particular theoretical cases which have no direct bearing on experimental processes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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(Excerpt from The Theory and Practice of Absolute Measurem...)
Excerpt from The Theory and Practice of Absolute Measurements in Electricity and Magnetism, Vol. 2 of 2 About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.
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(This is a reproduction of a book published before 1923. T...)
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(This book was originally published prior to 1923, and rep...)
This book was originally published prior to 1923, and represents a reproduction of an important historical work, maintaining the same format as the original work. While some publishers have opted to apply OCR (optical character recognition) technology to the process, we believe this leads to sub-optimal results (frequent typographical errors, strange characters and confusing formatting) and does not adequately preserve the historical character of the original artifact. We believe this work is culturally important in its original archival form. While we strive to adequately clean and digitally enhance the original work, there are occasionally instances where imperfections such as blurred or missing pages, poor pictures or errant marks may have been introduced due to either the quality of the original work or the scanning process itself. Despite these occasional imperfections, we have brought it back into print as part of our ongoing global book preservation commitment, providing customers with access to the best possible historical reprints. We appreciate your understanding of these occasional imperfections, and sincerely hope you enjoy seeing the book in a format as close as possible to that intended by the original publisher.
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(This is a reproduction of a book published before 1923. T...)
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GRAY, Andrew was born in 1847 in Scotland. Son of John Gray, Lochgelly, Fifeshire.
Studied at Subscription School, Lochgelly. Privately; Glasgow University. Master of Arts; Doctor of Laws.
Eglinton Fellow in Mathematics, Glasgow University, 1876. Private Secretary and Assistant to Sir W. Thomson (Lord Kelvin), 1875-1880. Official Assistant to Professor of National Phil, in Glasgow University, 1880 - 84.
Professor of Physics University College, of North Wales, 1884-1899. Professor of Natural Philosophy, University of Glasgow, since 1899. V. P.R.S.E.
(Excerpt from Absolute Measurements: In Electricity and Ma...)
(This book was originally published prior to 1923, and rep...)
(This book was originally published prior to 1923, and rep...)
(This book was originally published prior to 1923, and rep...)
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(Excerpt from The Theory and Practice of Absolute Measurem...)
(This is a pre-1923 historical reproduction that was curat...)
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(Lang:- English, Pages 419. Reprinted in 2015 with the hel...)
Fellow of the Royal Society.