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History of the manufacturer  

Leeds & Northrup; Philadelphia

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Name: Leeds & Northrup; Philadelphia    (USA)  
Abbreviation: leedsnorth
Products: Model types Others
Summary:

Leeds & Northrup Company; Philadelphia, Pennsylvania.

Hersteller von Galvanometern, Potentiometern, Brücken und anderen Präzisionsgeräten für Laboratorien.

Founded: 1899
Production: 1899 -
History:
Leeds & Northrup, was founded in 1899, in Philadelphia, Pennsylvania, by Morris E. Leeds. Originally known as Morris E. Leeds & Company and produced electrical measuring instruments for laboratory and testing use. The new firm made galvanometers, potentiometers, bridges, and other laboratory-type equipment of high quality. In 1903, Mr. Leeds took Dr. Edwin F. Northrup into partnership and the business was incorporated under the name of Leeds & Northrup.
Leeds & Northrup was acquired in 1978 by General Signal Corporation of Stanford, Connecticut. In 1980, the name of the division was changed from Expendable Devices to Leeds & Northrup Metallurgical Products. In 1995, General Signal sold the Metallurgical Products division to Heraeus Holding, GmbH of Hanau, Germany.
More Infos can be found at http://www.l-n-metprod.com/interior_h2.html

This manufacturer was suggested by Alexander Kusdas.


Some models:
Country Year Name 1st Tube Notes
USA  60 Wheatstone Bridge 5430-AM-1   Wheatstonesche Messbrücke, speziell für die Messung und Fehlerortung an Fernmeldeleitungen... 
USA  30 Multiple Range Potentiometer Indicator   Leeds & Northrup Multiple Range Potentiometer Indicator. 
USA  16 Ayrton Universal Shunt 2164   Western Electric - 1916 Electrical Supply Year Book: 'Model 2164 - Ayrton Universal S... 
USA  55 Voltage Divider 100000 ohms Cat. No. 4395    
USA  15 Battery Charger   Device for charging storage batteries.  Unit contained in a 5 gallon salt glazed c... 
USA  26 4258     The Kohlrausch Slide Wire, no. 4258, cost $100.00 in 1926. It has "end coils tha... 
USA  70 Amplifier 101133 12BH7  Most probably just for switching purpose. No AF. 
USA  30 Galvanometer 2370    
USA  50 5430 A , Test set I-49   Portable Wheatstone bridge, with internal batteries or optional external battery.  No... 
USA  20 Galvanometer No 81    
USA  65 Wheatstone Bridge 5305 Type S-2   Wheatstonesche Messbrücke, speziell für die Messung und Fehlerortung an Fernmeldeleitun... 
USA  30 Potentiometer K2   Potentiometer type K2.  Bakelite case with wooden base. Measuring instrument used ... 

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