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  • Leeds & Northrup Company

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

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