▁from ▁the ▁front ▁of ▁the ▁original ▁to ▁the ▁back ▁of ▁another ▁sheet , ▁mo ist ened ▁with ▁a ▁sol vent , ▁and ▁pressed ▁to ▁the ▁original . ▁The ▁second ▁sheet ▁had ▁to ▁be ▁thin , ▁so ▁that ▁the ▁in k ▁could ▁be ▁seen ▁through ▁it ▁when ▁the ▁copy ▁was ▁held ▁up ▁to ▁the ▁light , ▁thus ▁reprodu cing ▁the ▁original ▁exactly . ▁ ▁W att ▁started ▁to ▁develop ▁the ▁process ▁in ▁ 1 7 7 9 , ▁and ▁made ▁many ▁experiments ▁to ▁form ulate ▁the ▁in k , ▁select ▁the ▁thin ▁paper , ▁to ▁dev ise ▁a ▁method ▁for ▁wet ting ▁the ▁special ▁thin ▁paper , ▁and ▁to ▁make ▁a ▁press ▁suitable ▁for ▁applying ▁the ▁correct ▁pressure ▁to ▁effect ▁the ▁transfer . ▁All ▁of ▁these ▁required ▁much ▁experiment ation , ▁but ▁he ▁soon ▁had ▁enough ▁success ▁to ▁pat ent ▁the ▁process ▁a ▁year ▁later . ▁W att ▁formed ▁another ▁partners hip ▁with ▁B oul ton ▁( who ▁provided ▁finan cing ) ▁and ▁James ▁Ke ir ▁( to ▁manage ▁the ▁business ) ▁in ▁a ▁firm ▁called ▁James ▁W att ▁and ▁Co . ▁The ▁per fection ▁of ▁the ▁in vention ▁required ▁much ▁more ▁development ▁work ▁before ▁it ▁could ▁be ▁rout in ely ▁used ▁by ▁others , ▁but ▁this ▁was ▁carried ▁out ▁over ▁the ▁next ▁few ▁years . ▁B oul ton ▁and ▁W att ▁gave ▁up ▁their ▁shares ▁to ▁their ▁sons ▁in ▁ 1 7 9 4 . ▁It ▁became ▁a ▁commercial ▁success ▁and ▁was ▁widely ▁used ▁in ▁offices ▁even ▁into ▁the ▁tw enti eth ▁century