3 October in history.

1863 U.S. President Abraham Lincoln proclaimed the fourth Thursday in November to be a national day for Thanksgiving. He was prompted by the Union victory at Gettysburg. It has remained thus since. The previous practice of Thanksgiving had been ad hoc and on various dates across jurisdictions, and not a national holiday.
Thanksgiving Linc.jpg
1906 An international conference on telegraphy in Berlin established SOS as the signal of distress. Three dots three dashes three dots, ergo: …—… It does not stand for anything, but was chosen because it was distinctive.
SOS.png
1927 A trans-Atlantic telephone call between Canadian Prime minister McKenzie King and British Prime Minister Stanley Baldwin occurred.
transatlantic-telephone-cable.jpg
1935 Tasteless egg whites were dubbed Pavlova after Anna.
traditional-pavlova.jpg
1952 The British explode an Atomic bomb on Monte Bello Island in North West Australia. Britain is still paying compensation to the aboriginal people who were there exposed to radiation.
Monte bello.jpg