-
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
-
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
-
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…