Stromberg-Carlson tapered shaft "oil can" desk stand

Stromberg-Carlson tapered shaft "oil can" desk set with marked transmitter. This model has the ball mount right behind the transmitter. Stromberg-Carlson marked receiver. The scan is from an original 1904 ad in The American Telephone Journal showing this tapered shaft, "oil can" model. Also material from 1898 and 1900 publications.