▁is ▁more ▁well ▁known ▁for ▁his ▁design ▁of ▁the ▁Lincoln ▁Memorial . ▁ ▁Cond ition ▁According ▁to ▁the ▁Smith son ian ▁Art ▁In vent ories ▁database , ▁the ▁statue ▁was ▁last ▁survey ed ▁in ▁May ▁ 1 9 9 3 , ▁and ▁it ▁needed ▁some ▁treatment . ▁ ▁References ▁ ▁Category : 1 8 9 0 s ▁establish ments ▁in ▁Wisconsin ▁Category : 1 8 9 6 ▁sculpt ures ▁Category : Art icles ▁containing ▁video ▁cli ps ▁Category : B ron ze ▁sculpt ures ▁in ▁Wisconsin ▁Category : Mon uments ▁and ▁mem orial s ▁in ▁Wisconsin ▁Category : Out door ▁sculpt ures ▁in ▁Mil w au kee ▁Category : S cul pt ures ▁of ▁ang els ▁Category : S cul pt ures ▁of ▁women ▁in ▁Wisconsin ▁Category : Stat ues ▁in ▁Wisconsin <0x0A> </s> ▁Thomas ▁Harris ▁( d ied ▁ 2 5 ▁May ▁ 1 8 2 4 ) ▁was ▁a ▁pione ering ▁English ▁bal lo on ist ▁who ▁was ▁killed ▁in ▁an ▁accident . ▁There ▁is ▁little ▁information ▁about ▁his ▁early ▁career , ▁but ▁he ▁invent ed ▁the ▁gas ▁dis charge ▁val ve , ▁a ▁device ▁to ▁release ▁all ▁the ▁gas ▁in ▁a ▁gas ▁bal lo on ▁to ▁prevent ▁the ▁bal lo on ▁from ▁drag ging ▁after ▁landing . ▁ ▁Life ▁Thomas ▁Harris ▁was ▁an ▁invent ive ▁London ▁scient ist ▁and ▁held ▁the ▁military ▁rank ▁of ▁Lieutenant . ▁He ▁exhib ited ▁a ▁hydro gen ▁bal lo on ▁at ▁the ▁Royal ▁Tennis ▁Court ▁in ▁Great ▁Wind mill ▁Street , ▁Hay market , ▁in