▁industrial ists ▁in ▁the ▁craft ▁around ▁Glasgow ▁had ▁developed ▁the ▁expert ise ▁in ▁chem istry ▁processes ▁for ▁the ▁large ▁scale ▁industrial ▁printing ▁of ▁fab rics ▁for ▁which ▁these ▁plants ▁in ▁the ▁area ▁became ▁well ▁known , ▁both ▁for ▁domestic ▁and ▁foreign ▁supply . ▁ ▁William ▁Mac ad am ▁ ▁and ▁his ▁family ▁lived ▁at ▁ 1 6 9 ▁East ▁George ▁Street , ▁Glasgow , ▁Scotland . ▁and ▁Stevens on ' s ▁mother ▁was ▁his ▁father ' s ▁second ▁wife ▁Helen ▁Stevens on ▁( 1 8 0 3 – 1 8 5 7 ). ▁Helen ▁Stevens on ▁was ▁born ▁ 2 4 ▁August ▁ 1 8 0 3 . ▁The ▁wed ding ▁took ▁place ▁on ▁ 3 ▁January ▁ 1 8 2 5 ▁at ▁C lack mann an . ▁She ▁was ▁the ▁second ▁child ▁of ▁William ▁Stevens on ▁ ▁and ▁Helen ▁Gr ind lay . ▁She ▁died ▁on ▁ 2 0 ▁January ▁ 1 8 5 7 ▁at ▁ 6 ▁Kel vin h augh ▁Street , ▁Glasgow , ▁and ▁was ▁buried ▁with ▁her ▁husband ▁in ▁Glasgow ▁C athedral ▁( St . ▁M ung o ' s ) ▁Old ▁Bur ial ▁Gr ound ▁in ▁the ▁Mac ad am ▁tomb . ▁ ▁Father ' s ▁w ives ▁and ▁their ▁children ▁ ▁William ' s ▁first ▁wife ▁was ▁Rach el ▁Gent le ▁with ▁whom ▁he ▁had ▁one ▁son : ▁ ▁William ▁Mac ad am ', ▁the ▁el dest ▁child , ▁was ▁the ▁first ▁chemical ▁scient ist ▁in ▁the ▁family , ▁and ▁a ▁half ▁brother ▁to ▁Stevens on