▁phen yl ▁mag nes ium ▁b rom ide ▁and ▁c ob alt ▁ch lor ide ▁react ing ▁in ▁hydro gen ▁gas : ▁ ▁References ▁ ▁Category : C ob alt ▁comp ounds <0x0A> </s> ▁The ▁De F ries ▁House , ▁Bar n ▁and ▁Car p enter ▁Sh op ▁are ▁a ▁collection ▁of ▁historic ▁buildings ▁located ▁north - west ▁of ▁Andrew , ▁Iowa , ▁United ▁States . ▁ ▁They ▁are ▁three ▁of ▁over ▁ 2 1 7 ▁lim estone ▁structures ▁in ▁Jackson ▁County ▁from ▁the ▁mid - 1 9 th ▁century , ▁of ▁which ▁ 1 0 1 ▁were ▁houses , ▁nine ▁were ▁bar ns , ▁and ▁ 3 6 ▁were ▁other ▁farm - related ▁buildings . ▁The ▁stones ▁used ▁in ▁the ▁construction ▁are ▁of ▁various ▁sizes ▁and ▁shapes ▁and ▁laid ▁in ▁courses . ▁The ▁double ▁end ▁chim ne ys ▁on ▁the ▁house ▁are ▁found ▁on ▁only ▁two ▁other ▁stone ▁houses ▁in ▁the ▁county , ▁and ▁the ▁De F ries ▁and ▁Thomas ▁S ly e ▁houses ▁have ▁them ▁constructed ▁in ▁brick . ▁Also ▁similar ▁to ▁the ▁S ly e ▁house ▁is ▁the ▁use ▁of ▁jack ▁arch es ▁instead ▁of ▁l int els ▁above ▁the ▁windows ▁and ▁doors . ▁It ▁is ▁possible ▁that ▁both ▁houses ▁were ▁constructed ▁by ▁the ▁same ▁st on em ason . ▁While ▁the ▁st on em ason ▁for ▁the ▁S yle ▁house ▁is ▁unknown , ▁John ▁Christoph ▁" Christ ian " ▁B less ing , ▁who ▁was ▁trained ▁in ▁his ▁native ▁Germany , ▁built ▁this ▁collection ▁of ▁buildings ▁for ▁the ▁De