▁The ▁invent or ▁was ▁listed ▁as ▁Jer ome ▁T . ▁Smith ▁of ▁Scotland , ▁South ▁Dak ota . ▁ ▁In ▁ 1 9 1 8 , ▁Louis ▁and ▁his ▁wife ▁M abel ▁were ▁granted ▁a ▁pat ent ▁( US 1 2 7 5 7 2 3 ) ▁for ▁a ▁color ▁scale ▁en closed ▁in ▁a ▁glass ▁t ube ▁for ▁protection ▁against ▁so iling , ▁to ▁be ▁used ▁in ▁visual ▁evalu ations ▁of ▁colors ▁— ▁such ▁as ▁the ▁yellow ▁t ones ▁of ▁various ▁kinds ▁of ▁but ter , ▁or ▁lit mus ▁tests ▁of ▁acid ity . ▁A ▁" NA F IS ▁fault less ▁stir ring ▁rod ▁for ▁salt ▁test " ▁was ▁market ed ▁for ▁some ▁time ▁by ▁the ▁N af is ▁division ▁of ▁Kim ble ▁G lass . ▁ ▁In ▁ 1 9 2 1 , ▁he ▁was ▁granted ▁a ▁pat ent ▁( US 1 4 9 9 1 8 8 A ) ▁for ▁a ▁modified ▁Bab cock ▁bott le , ▁intended ▁to ▁be ▁less ▁sus cept ible ▁to ▁accident al ▁break age . ▁Instead ▁of ▁the ▁integral ▁long ▁graduated ▁neck , ▁it ▁had ▁a ▁short ▁neck ▁to ▁which ▁a ▁rub ber ▁ring ▁was ▁fitted . ▁After ▁processing ▁and ▁cent rif ug ing ▁the ▁milk ▁in ▁the ▁bottom ▁part , ▁two ▁other ▁glass ▁parts ▁would ▁be ▁added . ▁ ▁A ▁wider ▁glass ▁t ube ▁would ▁be ▁herm et ically ▁fitted ▁on ▁the ▁outer ▁edge ▁of ▁that ▁ring , ▁and ▁inside ▁it ▁would ▁be ▁placed ▁a ▁narrow ▁graduated ▁t ube , ▁with ▁a ▁fla red