This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Sending Coffee Quotations over Ticker System Scribners OM. en ticker system consisted of transmitters and tickers As of quotations were sent using transmitter 'the keyboard of which has much the same appearance as the keyboard of piano the black keys representing letters and the white keys figures and fractions ' transmitter of