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Leeds & Northrup Company

1903 - 1995

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Leeds & Northrup, manufacturers of electric instruments and pyrometers, was formed in 1903 when Morris Leeds of Morris E. Leed's & Co., manufacturers of electrical instruments, joined Edwin F. Northrup and became Leeds & Northrup Co. The firm was based in Philadelphia.

Leeds & Northrup later expanded their product line to include instruments such as galvanometers, standard resistances, and Wheatstone bridges, condensers, and potentiometers; temperature recording and other electrochemical apparatus.
Terms
  • United States
  • Philadelphia
For a biography see "Morris E. Leeds, 1869 - 1952," IEEE Global Hisory Network, http://www.ieeeghn.org/wiki/index.php/Morris_E._Leeds  (accessed 02/12/2015)
Modern Precision, Vol. 3, No.3
Directions for No 2430, D-C Galvanometer
Galvanometers: Catalog 20
New Type Portable D'Arsonval Galvanometer - No. 2320, Bulletin No. 232A
Vibration Galvanometer - Bulletin No. 235
Measuring Instruments for Research Teaching and Testing
Moving Coil Galvanometers - Catalogue 20
Notes On Moving Coil Galvanometers - Note Book No. 2
Measuring Instruments for Research, Teaching and Testing
Student's Kelvin Bridge, Bulletin No. 434
Mueller Bridges for Highly Precise Measurements of Temperature, Catalogue E-33C(1)
Industrial Plant Equipment
Student's Kelvin Bridge, Bulletin No. 434
The L&N Dial Decade Portable Testing Set
Standardization Apparatus: Apparatus for the Precise Measurement of Current, Electromotive Force, and Power Both AC and DC
Electrical Measuring Instruments for Research, Teaching, and Testing: A Condensed General Catalog of Laboratory and Portable Testing Instruments, Catalog E
Micromax Resistance Thermometers for Measurement and Control, Catalog N-33C
The Measurement of Conductivity of Electrolytes; Precision Conductivity Measurements, Commercial Apparatus, Students' Equipment, Price Lists, Catalogue 48
Directions for Setting Up and Operating Synchronizing Equipment
Portable Lamp and Scale Galvanometer - Bulletin No. 242
Pyrometer Price List, with Industrial Furnace-Pressure Control
Notes on Hydrogen Ion Measurements. Note Book 3
Students' Potentiometer
Portable Testing Sets and Cable Testing Apparatus, Factory Cable Testing Apparatus, Catalogue No. 50
Apparatus for Electrical Resistance Measurements: Catalog 40
The Leeds & Northrup Synchronyzing Fork, Bulletin No. 980A, p.3
Type K Potentiometer, Bulletin No. 755
Notes on Moving Coil Galvanometers - Note Book 2
Blueprint of "Method of Synchronizing a Rotary Converter"
Type K-3 Universal Guarded Potentiometer
Modern Precision, Vol 8, No. 1
Galvanometers - Catalogue No. 20
Apparatus for Electrolytic Conductivity Measurements, Catalog No. 48
Type K Potentiometers and Accessories, Catalogue EH22 (1)
Keys and Switches for Research, Teaching, and Testing, Catalogue EU2
Type K Potentiometer, Bulletin No. 755
The Leeds & Northrup Potentiometer, Catalogue 70
Modern Precision, Vol. 5, No. 1
Electrical Resistance Thermometeres and Pyrometers
Directions for No. 7552 (K-2) Potentiometer, Direction Book Std. 21071
Student's Potentiometer, Bulletin No. 765
The Carey Foster Bridge Standard Resistances, Catalogue 46
Keys for Electrical Testing, Catalog 30
Type K Potentiometer, Bulletin No. 755
Bulletin No. 680, p. 15
The Leeds & Northrup Standard Potentiometer
Mounted Photograph of the Type K-2 Potentiometer (Model No. 7552), Photograph # 4228
Brooks Deflection Potentiometer, Bulletin No. 763, Model No. 7630
Unit Type Wheatstone Bridge and Resistance Boxes, Bulletin No. 476A
Notes on the Kelvin Bridge, Note Book 4
Bridge for Locating Faults in Power Circuits, 536A
White Potentiometer, Bulletin No. 726
Leeds & Northrup Capacity Bridge and Accessories, Bulletin No. 120
Apparatus for Measuring Low Resistance and Conductivity, The Hoopes' Conductivity Bridge, Catalogue No. 40
Electrical Resistance Measurements, Catalogue 40
Notes on Cable Testing Together With Directions for Operating Leeds & Northrup Portable Testing Sets
Precisely Adjustable L&N Standard Air Capacitator
Mueller Bridges for Highly Precise Measurements of Temperature, Catalogue E-33C(1)
Directions: No. 8067 Mueller Temperature Bridge
Directions for Assembling and Operating L&N Lamp and Scale Reading Device No. 2100
Apparatus for D-C Resistance Measurements, Catalogue E-53
Directions for 2430 D-C Galvanometer, Issue 2
Directions for 2100 Lamp and Scale Reading Device
The Brooks Inductometer, Bulletin No. 152
A Universal Lamp and Scale, Bulletin No. 210
Thermonic Amplifier for pH & Other Potential Measurements in High Resistance Circuits, Catalogue E-00A
Potentiometer Pyrometers: Catalog 87
The Leeds & Northrup Type S Dial Decade Portable Testing Set; A Radical Improvement Over Previous Designs, Bulletin 530A
Apparatus for Capacitance, Inductance, and Magnetic Measurements: Catalogue 10
Directions for Operating L&N Galvanometer No. 2239 (Type P) - Standard Part 1092
Notes on Moving Coil Galvanometers - Note Book 1
Photometers: Catalog 60
Apparatus for Hydrogen Ion Concentration Measurements: Catalog 75
Upper-Air Weather Radioed to Speedomax Recorder
The Leeds & Northrup Vibration Galvanometer, Bulletin No. 235
Price List - Catalogue No. 20
Resistance Thermometers: Catalog 80
Galvanometer Lamp and Scale for Use with Leeds & Northrup Galvanometers. Bulletin No. 219 A
Keys and Switches: Catalog 30
Apparatus for Electrical Resistance Measurements: Catalog 40
Apparatus for Electrolytic Conductivity Measurements: Catalog 48
The Leeds & Northrup High Sensitivity Galvanometer
Portable D'Arsonval Galvanometer - Portable Insulation Testing Galvanometer, Bulletin No. 240A
Modern Precision, Vol. 10, No. 1
Apparatus for Capacitance, Inductance, and Magnetic Measurements: Catalog 10
Directions for Assembling and Operating L&N Lamp and Scale Reading Device No. 2100
Modern Precision, Vol. 8, No. 2
Directions No. 7553 Type K-3: Universal Potentiometer
Optical Pyrometers: Catalog 86
Directions for Assembing and Operating L&N Lamp and Scale Reading Device No. 2100
Directions No. 7552: Potentiometer
Directions for Adjusting L&N Galvanometer No. 2420
Directions for No. 2100 Lamp and Scale Reading Device, Direction Book Std. 1097

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