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Type 650-A Impedance Bridge
- After 1933
Rectangular wooden case with sloped top; black instrument panel on top surface; instrument panel features six connection posts for the external generator, a galvanometer meter under glass, nine black plastic knobs, four…
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Evelyn Photoelectric Colorimeter
- 1950 – 1959
Wooden box with metal instrument panel on top; four small black rubber feet on bottom; front of wooden box contains printed instructions and folds down to show inside of instrument; rectangular wooden area attached to…
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Sunderman Model RCM14B Direct Reading Type Conductivity Bridge
- Undated
Wooden box with black metal instrument panel; four padded metal feet on bottom; leather handle attached to side with two nickel connectors; nickel lock on side of base and lid; lid connects to base via two coated metal…
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Galvanometer
- 1960
Six volt galvanometer in a rectangular wooden case with rubber feet. A brass lever at the top of the case provides coarse zero adjustment; two black plastic and metal knobs on the right side of the case provide fine…
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Sunderman Model RCM14B1 Conductivity Bridge
- Circa 1950
Hardwood case with a leather handle and metal hinges and clasp; aluminium interior instrument panel has black finish; instructions on paper are inside the lid; the instrument panel features four black plastic knobs, two…
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Weston Ammeter Model 45
- 1888
Finished wooden box; four metal feet on bottom (box must be set on its side for instrument to function); top of box has two brass holders for missing handle and metal strip; side lifts up half way exposing a painted…
- Manufacturer Weston Electrical Instrument Corporation
- Subject Ammeters, Weston Electrical Instrument Corporation
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Potentiometer
- Undated
Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…
- Manufacturer Leeds and Northrup Company
- Subject Potentiometer, Leeds and Northrup Company
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Variable Capacitor
- Undated
Tall rectangular wooden base with black plastic instrument panel; instrument panel is attached to base via four metal screws, two on each side; two small black plastic knobs that adjust up and down as they are turned…
- Manufacturer Leeds and Northrup Company
- Subject Variable capacitors, Leeds and Northrup Company
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Precision Condenser Type 722-N
- After 1944
Wooden box with no lid; black painted metal instrument panel on top; engraved writing on top left corner; two metal knobs projecting from panel on upper right side most likely for running electrical current;…
- Manufacturer General Radio Company
- Subject Capacitors, General Radio Company
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Portable Hydrogen Ion Potentiometer
- Circa 1960
Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…
- Manufacturer Leeds and Northrup Company
- Subject Potentiometer, Leeds and Northrup Company
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Variable Resistor
- Undated
Variable resistors are also known as potentiometers. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and…
- Manufacturer Leeds and Northrup Company
- Subject Variable Resistor, Potentiometer, Leeds and Northrup Company
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Manual Variable Resistor Box
- Undated
Variable resistors are also known as potentiometers. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and…
- Manufacturer Siemens & Halske
- Subject Variable Resistor, Potentiometer, Siemens & Halske
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Weston Galvanometer
- Undated
Rectangular wooden box; brown leather handle attached to top with metal fasteners; front has a steel lock screwed to it; lock is stamped with manufacturer; four hard black rubber feet on bottom; top attached with two…
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Weston Direct Current Voltmeter with Case
- After 1888
Direct current voltmeter, Model 1. Instrument mounted on brown felt on a hardwood base, with a brass tag in front; instrument made of metal and finished in orange-brown; two electrical connections covered in black…
- Manufacturer Weston Electrical Instrument Co.
- Subject Voltmeters, Measuring instruments, Weston Electrical Instrument Co.
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Test Tube Rack
- Undated
Rectangular wooden apparatus for holding fifteen test tubes upright. Heavy tape has been attached to all four sides.
- Subject MacDiarmid, Alan G., 1927-2007, Test tubes
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Employees at work in Dow Glass Fabrication department
- 1952
View of two unidentified employees shaping assorted laboratory glassware in the Dow Chemical Company's Glass Fabrication department. The man on the left (closest to the camera) is seen using a table-top blow torch to…
- Creator Of Work Dow Chemical Company
- Photographer Korling, Torkel
- Subject Employees, Glass blowing and working, Laboratories, Dow Chemical Company, Glass manufacture, Glassware
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Bill Beamer at work in Dow Spectroscopy Laboratory
- 1952
General view of technician Bill Beamer operating an unidentified machine in the Dow Chemical Company's Spectroscopy Laboratory.
- Creator Of Work Dow Chemical Company
- Photographer Korling, Torkel
- Subject Spectrum analysis, Laboratories, Dow Chemical Company, Machinery, Employees, Scientific apparatus and instruments, Beamer, Bill
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Endurance testing of aircraft hydraulic pump
- 1958
General view of machinery used to conduct endurance tests of high-temperature (400 degrees Fahrenheit), high-pressure (3000psi) aircraft hydraulic pump at the Naval Air Material Center's Aeronautical Materials…
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General view of the Plastics Testing area
- 1958
General view of the Plastics Testing area at the Naval Air Material Center's Aeronautical Materials Laboratory. Technicians are seen working with assorted equipment used to simulate various service conditions and test…
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Tensile testing of new aircraft alloys
- 1955
General view of technicians conducting tensile tests on new aircraft alloys at the Naval Air Material Center's Aeronautical Materials Laboratory. In tensile, or tension, testing, tensile machines are used to subject…
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Engineers calendering experimental stocks of rubber
- Circa 1949
View of two engineers, Stanley Bilker (background) and Ralph Harper (foreground), operating the calender sheeting machine at the the Naval Air Experimental Station's Rubber Compounding and Processing Laboratory. The…