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537 items
Telegraph Recorder
This telegraph recorder used tape to record dots and dashes. It is missing its stylus.
Rotator with Governor
Table and all attachments cost $40. Apparatus includes rotator table, Rotator part with brass circles to show shape of rotating earth, other
Rotator part demonstrating centrifugal force (like Watt governor), Doppler whistle, and Rotator crank wheel.