reflecting galvanometer (1) - Wood, metal - Early 20th century

Are you interested in this item? This item is up for auction at Catawiki. Please click on "respond to advert" (orange button) to get redirected to the Catawiki website. Catawiki’s goal is to make special objects universally available. Our weekly auctions feature thousands of unusual, rare, and exceptional objects you won’t find in just any store. Magnetic relay switch with a magnet and a small mirror in the middle, but I don't know what it can be used for despite my research on the web.
For the characteristics see the many photos.
Weight over 1 kilo and dimensions are 35.5cmx9cmx3cm
Fast, neat and traced shipping 67378909 Read more