Show Culm 01 Vtun The limit ol normal s 111011 or healthy tight unassisted by Inilrmntnli ol any kind In a perfectly clear ntmotpherr and where there arc no obitruclloni whatever It at follows Ala height sal 5 feel the range of lit lance It I IJ2 miles At a height of lu feet the range ol dlttance It 591 miles Ala height ol So feel the range ol normal vision It I < i3 mllet Ala height ol loo feet the range ol dlttance It 11 miles At a height ol w feel It It I oaclly ayS mile Ala helM ol In feet the range of dlitance It 3t8 miles Ala height of j fret the range of dlitance It 94 miles exactly It follows from Ihli that a man of ordinary or-dinary height may be teen on level ground a dlitalice ol three tulles everything being latorablc |