You Searched For
Start Over You searched for: Date 1954 to 1955 Remove constraint Date: <span class="from" data-blrl-begin="1954">1954</span> to <span class="to" data-blrl-end="1955">1955</span>-
Drillability machine and hopper at the Agricultural Engineering Laboratory
- 1955-Jan-25
General view of the drillability machine at the U.S. Department of Agriculture's Agricultural Engineering Laboratory showing the distribution of wet granular fertilizer as deposited by the Grether hopper.
-
2 items
Students' Potentiometer
- 1950s
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
-
Double flask for demonstrating anaerobic fermentation
- 1939 – 1967 (Date span attributed to photograph)
Photograph of a double flask used by French biologist, microbiologist, and chemist Louis Pasteur (1822-1895) to demonstrate anaerobic fermentation, as displayed at the Pasteur Institute in Paris. Per notations…
-
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…
-
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…
-
Autoclave at the Aeronautical Materials Laboratory
- 1950s – circa
General view of an autoclave, used for the fabrication of plastics, at the Naval Air Engineering Center's Aeronautical Materials Laboratory. In the foreground, Laboratory Technical Director J. Hartley Bowen, Jr.…