ISBN: 9781154966510

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 … Plus…

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. 1878 edition. Excerpt: ... ask Mr. Walker what is the diameter of the No. 46. Mr. C. V. Walker: No. 46 of my unit is the 640th part of an inch. Mr. W. Hall: I fear that it would be difficult to construct a gauge which would give accurate measurements for such a fine wire that would enable the telegraph engineer to calculate the resistance and quality of copper under examination. I have myself a very beautiful gauge made by Elliott Brothers which is accurate enough for all practical purposes. But in all my experiments I always take 176 yards ( mils.) of copper wire, and weigh it and calculate its diameter, then test for resistance; and lastly for conductivity (see Formula and Tables). In one of my experiments I found the gauge gave a diameter of 006 (6 mils.), whereas the true diameter of the wire was-O0609 (609 mils.) by calculation, quality of copper under examination was 95 per cent., hence the difficulty experienced in using gauges for fine wire. I grant that a gauge is useful for large and medium size wires for telegraph and other purposes, but when it is necessary for the engineer to ascertain the quality of the copper wire, I think no better method can be adopted than that of obtaining the diameter from the formula herein described. At the same time I agree with Mr. C. V-Walker and Mr. Clark that a good standard gauge is indispensable for commercial purposes, in order to enable the London and Birmingham houses to draw their wires of one uniform size. Mr. Lecky: I agree with Mr. Hall in one thing--that is, that the determination of diameter by weight would be useful; and if ever again there is a table of sizes made, I think the weights for certain lengths ought to be given with the gauge. There is one point which I do not think has... Alexander Thomas Ormond, Institution Of Electrical Engineers, Books, History, Proceedings of the Institution of Electrical Engineers Volume 7 Books>History, General Books LLC<

ISBN: 9781154966510

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 … Plus…

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. 1878 edition. Excerpt: ... ask Mr. Walker what is the diameter of the No. 46. Mr. C. V. Walker: No. 46 of my unit is the 640th part of an inch. Mr. W. Hall: I fear that it would be difficult to construct a gauge which would give accurate measurements for such a fine wire that would enable the telegraph engineer to calculate the resistance and quality of copper under examination. I have myself a very beautiful gauge made by Elliott Brothers which is accurate enough for all practical purposes. But in all my experiments I always take 176 yards ( mils.) of copper wire, and weigh it and calculate its diameter, then test for resistance; and lastly for conductivity (see Formula and Tables). In one of my experiments I found the gauge gave a diameter of 006 (6 mils.), whereas the true diameter of the wire was-O0609 (609 mils.) by calculation, quality of copper under examination was 95 per cent., hence the difficulty experienced in using gauges for fine wire. I grant that a gauge is useful for large and medium size wires for telegraph and other purposes, but when it is necessary for the engineer to ascertain the quality of the copper wire, I think no better method can be adopted than that of obtaining the diameter from the formula herein described. At the same time I agree with Mr. C. V-Walker and Mr. Clark that a good standard gauge is indispensable for commercial purposes, in order to enable the London and Birmingham houses to draw their wires of one uniform size. Mr. Lecky: I agree with Mr. Hall in one thing--that is, that the determination of diameter by weight would be useful; and if ever again there is a table of sizes made, I think the weights for certain lengths ought to be given with the gauge. There is one point which I do not think has... Alexander Thomas Ormond, Institution Of Electrical Engineers, Books, History, Proceedings of the Institution of Electrical Engineers Volume 7 Books>History <