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
Omnigraph

Date:

c. 1904

Material:

Steel and brass mechanism, wooden base

Company:

The Omnigraph Co.

Location:

New York

A disc for a Morse code training device. Notches around its edge encode dots and dashes, opening and closing an electrical contact as the disc rotates, causing the sounder to click.