Tangible Media: Removable Storage of Image, Sound, Motion and Data
Tangible Media: Removable Storage of Image, Sound, Motion and Data
Tangible Media: Removable Storage of Image, Sound, Motion and Data
Profile
Teleplex

Date:

1920s–1930s

Material:

Aluminum

Company:

National Radio Institute

Location:

Washington, D.C., United States

For Morse code training. The cylinder is equivalent to a stack of Omnigraph discs. Notches on its surface open and close an electric circuit. The "shoe" can be raised and lowered. The Morse code key and sounder were added by a previous owner, who presumably constructed the box.

Close up of cylinder showing dots and dashes
Friction drive. Turning the knob (shown in next image) on the top of device moves the cone-shaped drive up or down, which engages a greater or lesser diameter with the disk.