In the earlier format, a photography required hours of exposure while the technique invented by Daguerre reduced the time to 20-30 minutes. This format made use of a technique that involved exposing a silver iodide coated copper plate to light that was later fumed with mercury vapour. This was later treated with a solution of common salt that later formed a permanent image. With this format gaining popularity, many later inventions reduced the exposure time to 40 seconds by 1841.
Born on Nov 18, 1787 in Cormeilles-en-Parisis in France, Daguerre had interests in the field of architecture, theater design, and painting. He is also credited as the inventor of the diorama along with De Dion-Bouton. Daguerre died of heart attack on July 10, 1851.
The Google Doodle dedicated to Daguerre shows a family of five with their faces depicting the word Google. Incidentally, the father in the image resembles Daguerre himself.
Google comes up with the timely doodles honouring artists, musicians and other famous personalities. Google Doodles have become so popular for their fun, interactive nature and never fails to impress users. They have also celebrated news events, civic milestones, birthdays, death anniversaries and dates of historic importance with equal fanfare.