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Historic milestones[edit]



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.

- (talk) 23:10, 3 July 2009 (UTC)

What happened to Manganin?[edit]

Circa 1890, the discovery of Manganin was a big deal. By 2009 it has faded from the scene. Why? Has the material stopped being used, or just the name? What is used most commonly for similar purposes now, and what names are used? - (talk) 03:09, 4 July 2009 (UTC)

Manganin is a registered Trademark of Isabellenhüte Heusler GmbH & Co. KG, Germany. Isabellenhütte developed 1889 together with the PTR (Physikalisch technische Reichsanstalt in Brunswick) the alloy Manganin® as protected copper-manganese-nickel alloy. It's still in use for precision resistors and current measuring shunts (Automotive industry). Similar alloys like Zeranin® and ISA-OHM® were developed later and are still in use too. The development of Isabellenhütte was three years before Edward Westons. I believe this side should be revised.--RTViehmann (talk) 13:41, 23 October 2009 (UTC)

Severe Formatting Problem[edit]

Could the data presented as text boxes in this article be better represented in a graph or table? Right now it looks very much like a bad copy/paste job. Darkwraith (talk) 01:19, 15 October 2009 (UTC)

strain vs hydrostatic pressure effect on resistance[edit]

this is a little confusing for someone non-technically minded, but basically the article says that stretching of the manganin wire/foil has little effect on its resistance, but exposing it to pressure (which causes the stretching) has great effect on the resistance. This is valuable information and needs to be further explained by someone more knowledgeable. Strain resistance strips are commonly used on structural pieces of steel and so on, so this manganin use should be explained more, how does it measure stress, but not strain. — Preceding unsigned comment added by (talk) 18:37, 2 March 2017 (UTC)