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

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