Archive for February 21, 2024
First Telephone Book Published
February 21, 1878
The first telephone book is issued in New Haven, Connecticut by the New Haven Telephone Company. It lists twenty-one names. You probably have at least twice as many names in your cell phone today!
First Burglar Alarm Installed
February 21, 1858
The first electrical burglar alarm is installed by inventor Edwin T. Holmes in Boston, Massachusetts. It was a very simple system that rang a bell if a door or window was opened.
Edison Patents Light Switch, Sort Of
February 21, 1893
Thomas Edison receives three US patents on this day, two of which are in essence the first light switches: “Cut Out for Incandescent Electric Lamps” (US Patent 491,992) and “Stop Device.” (US Patent 491,993).