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
Natrometer II

Date:

1920s-1930s

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 The Morse code key and sounder were added by a previous owner, who also constructed the box.

Speed controller. Turning the knob (below) on the top of device moves the controller up or down, which engages a greater or lesser diameter on the controller.