Underwater Railways 





.T«:::op°f :Tsiirr°r: ',?- °^ ?-"—" "« o-„. sec 



a manner suggestln^g ti?e^ evol^^tfon^l oTl ^p^p^o^^ 



Davidson's idea is a cylindrical car running on a 



IvorsThe niu'.l n^ " "\^'^' ^^"^ GunSorfe? 

 f^r^ tne Illusion of a submarine of conventional 

 form which has convenient observation So^ 



