Thomas Edison demonstrated his hand-cranked phonograph for the first time.
He demonstrated it at the USA's Scientific American office, which was the first of many demonstrations of the phonograph across the world. Edison patented the phonograph on February 19, 1878. This was the start of audio recording and was very advanced for the time.
Amateur British chemist Sir James Jay invented invisible ink on this day.
After experimenting and narrowing down his secret ingredients to just two fluids, Jay would send letters to his brother John in the US. James Jay even sent letters to Benjamin Franklin warning him of Britain's plans for forced submission of colonies.
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