Signal Learner Telegraph Sets telegraph practice devices
This object consists of two essentially identical parts. Each part has a 2 x 2 1/2-inch paper label on the bottom with printed operating instructions and manufacturer's information. Each part has "4 Ohms" stamped into the top of the wooden base. "Signal Electric Mfg. Co., Menominee, Mich." is stamped into the side of the silver-colored "clicker" bar on each part.