Signal Electric Learner Telegraph Set M-110 Circ 1941
This Key on Board Telegraph Learner Set by Signal Electric Manufacturing Co of Menominee Michigan and distributed by Central Scientific Company was advertised in the Signal Electric Catalogue of 1941 and designated as a M-110 which was the 4 Ohm version and priced at $5.75 with the 20 Ohm version, the M-111 being priced at $6.00. It was described as having a bar frame and key base of black enamel, the bridge of brass, sounding bar of aluminium with black lacquered steel sounder plate. Key lever is nickel plated and the key and sounder being based on a mahogany finish wood base.
Central Scientific Company
Central Scientific Company was founded in 1900 in downtown Chicago. It was formed out of what was left of the Olmstad Scientific Company. Central Scientific manufactured and distributed science teaching equipment for schools, colleges, and universities by catalog mail order. The trademark "CENCO" was used from 1909 onwards. CENCO dominated the field of selling science education equipment through their mail order catalog. By 1935, the company established itself as one of the leading national suppliers of science equipment. During World War II, part of the manufacturing facility was turned over to the production of war necessities, making bombsights for airplanes and fuses for large bombs. After 1968, the company began having financial difficulties. In 1974, the assets were sold off to competitors. The educational business retained the name Central Scientific Company. In April 1979, Central Scientific's assets and activities were acquired by two businessmen from Buffalo, New York. They sold the business to Sargent-Welch (their main competitor) in 2000.