Talk:Constantan

Inconsistent numbers for mechanical properties

1) The value given for the elastic modulus (24 x 106 psi) was most likely a typo -- assuming 24 x 10^6 psi instead (24 Mpsi), which is consistent with the data quoted under "Physical properties".

2) The value given for UTS (60 kpsi) was inconsistent with the data quoted under "Physical properties" (455-860 GPa = ~66-125 Mpsi) -- recalculated.

3) The value for "Elongation at break" at both places is nonsense -- 25% (or 45%) elongation at a modulus of 160 GPa means UTS in the vicinity of 40 (or 80) GPa, which is off by two orders of magnitude. Assuming 0.25% (and 0.45%) instead. — Preceding unsigned comment added by 92.247.118.230 (talk) 10:15, 7 November 2017 (UTC)[reply]

Cu86Mn12Ni2

Should a chemical formula be listed for Manganin (Cu86Mn12Ni2)? This appears to be the percentages of each metal in the alloy. Does this constitute a correct chemical formula? Should it be listed on this page about constantan? It sould be noted that this formula does not appear on the Manganin page. 165.254.210.2 14:12, 5 July 2007 (UTC)[reply]

Removed. Scotteaton92 (talk) 19:38, 29 August 2019 (UTC)[reply]

Historic milestones

http://www.archive.org/stream/chronologicalhis00natirich/chronologicalhis00natirich_djvu.txt

A CHRONOLOGICAL HISTORY OF ELECTRICAL DEVELOPMENT FROM 600 B.C.

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION; 155 EAST 44th STREET; NEW YORK 17, N. Y.; PRICE $2.00

Excerpts from this book may be used without permission

Weston, Dr. Edward, 1872, 1875, 1876, 1877, 1878, 1885, 1887, 1888, 1890, 1893, 1896

Weston Electrical Instrument Co., 1888

1887 Dr. Edward Weston compounds a workable German silver alloy containing thirty per cent nickel. He discovers an alloy, later known as "Constantan," in which it is shown for the first time that a metal can have a negative temperature coefficient of resistance, that is, its resistance becomes less with increasing temperature. The invention of "Manganin," the alloy now used universally for resistors of high accuracy, followed shortly thereafter. The resistance of "Manganin" is virtually constant within reasonable temperature limits.

1888 The Weston Electrical Instrument Co. is formed by Edward Weston. Dr. Weston formulates the design principle for a permanent magnetic system. The first permanent magnet, movable coil, direct reading electrical measuring instrument was developed and placed on the American market by Dr. Weston.

1893 The external shunt type of ammeter is invented by Dr. Edward Weston. The shunt in connection with a millivoltmeter was first used especially for measuring high currents. A patent was issued on Weston standard cell and later was dedicated to the public. The standard cell is used as a reference basis for the "volt" and is found in every standardizing laboratory in the world.

-71.174.175.104 (talk) 23:15, 3 July 2009 (UTC)[reply]

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