Leeds & Northrup
Leeds & Northrup (L&N) Instruments started in 1903 when Morris Leeds and Edwin Northrup banded together in Philadelphia, Pennsylvania, to design and manufacture precision test equipment. Leeds & Northrup’s main market for the instruments was laboratory experimentation in colleges and universities. As the company grew, it became a manufacturer of industrial tools for temperature sensor calibration and temperature monitoring, such as thermocouples and transducers. L&N built current shunts, galvanometers, potentiometers, decade boxes, and Wheatstone Bridges. Some L&N bridges were used to locate shorts in multi-conductor cabling. You can find used and refurbished Leeds & Northrup resistors, shunts, and bridges at ValueTronics.