▁on ▁to ▁pat ent ▁a ▁three - col our ▁c ine ▁film ▁that ▁was ▁manufact ured ▁under ▁license ▁by ▁East man ▁K od ak . ▁Thor nt on ▁eventually ▁returned ▁to ▁England , ▁and ▁died ▁some ▁years ▁later ▁in ▁ 1 9 4 0 . ▁ ▁Following ▁the ▁loss ▁of ▁its ▁found ers , ▁Thor nt on - P ick ard ▁continued ▁to ▁manufact ure ▁cam eras . ▁The ▁successful ▁" Im per ial ▁Tri ple ▁Ext ension " ▁model ▁was ▁introduced ▁in ▁ 1 9 1 3 , ▁and ▁continued ▁in ▁production ▁until ▁the ▁ 1 9 3 0 s . ▁During ▁the ▁First ▁World ▁War , ▁the ▁company ▁produced ▁a ▁number ▁of ▁cam eras ▁for ▁military ▁use , ▁including ▁the ▁Mark ▁III ▁Hy the ▁gun ▁camera . ▁In ▁ 1 9 2 1 ▁the ▁company ▁merged ▁with ▁several ▁others ▁to ▁form ▁Am alg am ated ▁Phot ographic ▁Man ufact ur ers . ▁Through out ▁the ▁ 1 9 2 0 s ▁and ▁ 1 9 3 0 s ▁the ▁company ▁found ▁it ▁increasing ly ▁difficult ▁to ▁comp ete ▁with ▁che aper ▁imported ▁cam eras , ▁and ▁ceased ▁trad ing ▁in ▁ 1 9 3 9 . ▁ ▁References ▁ ▁Thor nt on - P ick ard ▁Man ufact uring ▁Co ▁Ltd ▁history ▁Access ed ▁ 2 0 ▁August ▁ 2 0 1 2 ▁ ▁Thor nt on - P ick ard ▁Camera ▁listing ▁and ▁Catalog ▁Information ▁at ▁Historic ▁Camera ▁ ▁Category : Ph ot ography ▁companies ▁of ▁the ▁United ▁Kingdom ▁Category