Restoring a Teletype Model 15, introduced in 1930

The typing unit was placed in a large Rubbermaid container, standing on its right end, so that the selector magnet, the only electrical component, was at the top. The sliding electrical contacts which connect base, keyboard, and typing unit were brushed until they showed untarnished surfaces. The unit was connected to the 120VDC power supply through a 2K resistor, as above, with the keyboard and typing unit connected in series.

Source: www.aetherltd.com