Talk:Constantan

message: 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)
thread_title: Inconsistent numbers for mechanical properties

message: 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)
thread_title: Cu86Mn12Ni2

message: 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 
Copyright 1946;
National Electrical Manufacturers Association;
Printed in U. S. A. 
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)
thread_title:  Historic milestones 

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thread_title:  External links modified