Check the listing for details. Vintage Leeds and Northrup Wheatstone Bridge. Condition: Used. Listed at 199.00 USD. Vintage Leeds and Northrup Wheatstone BridgeUntested and in very good cosmetic condition. Used to locate cable trouble as early as 1940s. Detected where issues were in telephone lines. RN-1 Wheatstone bridge with case. Well preserved, has been in storage for years. Untested but has no known issues. Former Michigan Bell inventory, last calibrated 1989. This vintage Leeds and Northrup Wheatstone Bridge is a unique addition to any collection of scientific instruments. Made in the United States, this bridge is a rare find for collectors of vintage science equipment. Its classic design and historical significance make it a must-have for any science enthusiast. Wheatstone Bridge is a collectible item that represents the advancement of science and technology. Its accurate measurements and durable construction make it a valuable asset to any collection. This item is perfect for display in a laboratory or office, and its history is sure to spark conversation. A Wheatstone bridge circuit is an electrical circuit that measures an unknown electrical resistance by balancing two legs of a bridge circuit. The circuit is made up of four resistors, two of which have known values, one of which is adjustable, and the fourth of which has an unknown value.