OTD 21.11 November 21st Traditional Cache

OTD - 21:11 

Perhaps you want a smiley for every day of the year or maybe a birthday smiley. For whatever reason these 12 mini monthly power trails are here to be found. Most are easily located, with an occasional sneaky one in the mix, sat lock can be difficult in some areas.

Here are some facts for this day. You are welcome to log your interesting, quirky or fun fact/s with your log.

On This Day - November 21st 1877

Thomas Edison announces his invention of a 'talking machine', which preceded the phonograph. 

Thomas Alva Edison was born on 11 February 1847, in Milan, Ohio, USA. Although probably best known for developing the light bulb and the phonograph, Edison was a prolific inventor, registering 1093 patents by the time he died in 1931. On 21 November 1877, Edison announced his invention of a "talking machine", the precursor to the phonograph, which provided a way to record and play back sound.

Edison came upon the invention by accident, whilst trying to find a way to improve the efficiency of a telegraph transmitter. He noticed that the needle could prick paper tape to record a message but the paper did not last for many recordings. This led him to experiment with trying a stylus on a tinfoil cylinder. He then moved on to experimenting with silverfoil which, while more expensive, was smoother and recorded better. Edison experimented with cylinder as well as disc tinfoil phonographs, and in 1878 developed a clockwork motor disc phonograph.