Early Photography: Niépce, Talbot and Muybridge
Read and watch at Khan Academy.
The link address is: https://www.khanacademy.org/humanities/becoming-modern/early-photography/a/early-photography-nipce-talbot-and-muybridge
The link address is: https://www.khanacademy.org/humanities/becoming-modern/early-photography/a/early-photography-nipce-talbot-and-muybridge