Located in New York City, they were known for producing a range of devices for measurement and experimentation, catering to both educational institutions and industrial clients. Their instruments often featured robust construction and precise calibration for their time. This milliamperemeter, indicated by the “Milli-ampere-meter” inscription, was used to measure small electrical currents. 25 Ohms likely refers to the internal resistance of the meter. Such instruments were crucial for the development and understanding of electrical engineering during a period of rapid technological advancement.