1890-1895

Phalke explains his photographs of the gas balloon to his students. He has joined Kala Bhuvan as a teacher. He lectures:

'Photograpy depends upon two basic operations- the formation of an image on a flat surface by an optical device, and a chemical method of sentizing that surface to light so that the image can be captured permanantly.

The first requirement was met by camera obscura, known since the 16th century and used by artists as an aid to sketching.

Wedgewood was the first one to make a light-sensitive material when, in about 1800, hetreated white leather and paper with silver salt.