▁their ▁bodies . ▁ ▁Louis ▁N af is ▁was ▁an ▁active ▁member ▁of ▁the ▁American ▁D air y ▁Science ▁Association ▁( AD SA ) ▁and ▁of ▁the ▁local ▁Mason ic ▁l odge . ▁ ▁Louis ▁Nas if ▁was ▁married ▁to ▁M abel ▁S iller ▁Nas if ▁and ▁had ▁a ▁sister , ▁Em ily ▁N af is . ▁ ▁In vent ions ▁In ▁ 1 9 0 1 , ▁Louis ▁N af is ▁obtained ▁a ▁pat ent ▁( US 6 8 4 8 5 0 A ) ▁for ▁a ▁tool ▁to ▁verify ▁the ▁accuracy ▁of ▁the ▁graduated ▁scale ▁on ▁the ▁neck ▁of ▁the ▁standard ▁Bab cock ▁bott le . ▁ ▁It ▁consisted ▁of ▁two ▁sl ender ▁metal ▁cyl ind ers ▁connected ▁length wise ▁by ▁a ▁thin ▁rod ▁and ▁to pped ▁by ▁a ▁wire ▁handle . ▁ ▁The ▁device ▁was ▁supposed ▁to ▁be ▁inserted ▁into ▁the ▁neck ▁of ▁the ▁bott le , ▁previously ▁filled ▁with ▁water ▁to ▁the ▁" 0 %" ▁mark . ▁ ▁As ▁the ▁two ▁cyl ind ers ▁were ▁pushed ▁into ▁the ▁liquid , ▁its ▁level ▁on ▁the ▁neck , ▁if ▁correctly ▁graduated , ▁should ▁rise ▁to ▁the ▁" 4 %" ▁and ▁to ▁the ▁" 8 %" ▁mark , ▁respectively . ▁ ▁In ▁ 1 9 1 7 , ▁the ▁Louis ▁F . ▁N af is ▁company ▁was ▁awarded ▁a ▁pat ent ▁( US 1 2 6 1 4 5 1 ) ▁for ▁a ▁special ▁cal i per ▁to ▁measure ▁the ▁distance ▁between ▁gradu ations ▁of ▁the ▁Bab cock ▁bott le . ▁