Show curiosities orvillen orv of islen the limit oi of normal vision or healthy tight unas unassisted isted by instruments of any any kind in a perfectly clear atmosphere and where there are no obstructions whatever whit ever r is as follows at a height of 5 feet the hie range ot of distance Is 13 2 miles at a height of lo io feet the range of distance is 5 91 miles at a height of so 50 feet tile the range of normal vision is miles at a height of too loo feet the range of distance is miles at a height oi of acet it Is exactly 29 5 miles at a heigh heig hot of 1003 1103 the range of distance is 41 9 miles at a heig height lt of feet the range ot of distance is 94 miles exactly it follows front from this that a man of ordinary height may be seen on level ground at a distance of three lice everything being favorable |