Richard Leach Maddox
Richard Leach Maddox ( 4 August 1816 – 11 May 1902 ) was an English photographer and physician who invented lightweight gelatin negative plates for photography in 1871 . 
<triplet> Richard Leach Maddox <subj> 4 August 1816 <obj> date of birth <subj> 11 May 1902 <obj> date of death