America 250 Candidate: Stock Ticker
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AUTOMATION HISTORY · AMERICA 250 · REPLACEMENT CANDIDATE
Stock Ticker
American milestone: 1867 · Edward A. Calahan · New York
Status: Replacement candidate. Final number pending chronology audit.
Why it belongs in America 250
Edward Calahan demonstrated a practical stock ticker in 1867 for distributing market quotations to brokerage offices. The Smithsonian identifies his system as a major modernization of stock-market information flow.
Connection to automation
The ticker automatically converted telegraph signals into printed market information, an early form of real-time machine-to-machine data distribution.