1930s Post Office Galvanometer GPO 1860
This is an exquisite 1930s Post Office Galvanometer GPO 1860. It was originally used for testing signal direction (Current) in telegraphy systems, and also as a test instrument in conjunction with a battery.
There is no manufacturer’s mark but the high quality of the instrument could mean it was made by a renown manufacturer e.g. Edison & Swan, H.W Sullivan, Pye or Cambridge Instruments.
This instrument was also known as a linesmen detector or Q & I (Quantity and Intensity) detector. They had two sensitivities; the Quantity or ‘Q’ coil of about.2 ohm, and the Intensity or ‘I’ coil of about 100 ohms.
The outer casing is brass mounted in to wood. The top is glass, and the centre point meter is clearly visible through the glass.
There are two handwritten notes, inserted into the back of the galvanometer, where someone has, unsuccessfully, attempted to make accurate measurements. Hence, we are selling this as a collector’s piece only.
- Case Width: 8.8cm (3.5″)
- Height (Including block and knobs): 11cm (4.3″)
- Depth: 5.8cm (2.3″)
This beautiful scientific instrument is a must for collectors of vintage electronic/ physics/ science equipment or as a display item in an office, University, or man-cave.
There is one of these on display at the Museum of Technology in Spalding, Lincolnshire
For other vintage scientific items then please click on the following link.