RECENT PROGRESS IN AERIAL' NAVIGATION. 617 



Fig. 5 is a design of Theodore Liebrand. The cylinder is of 

 aluminum, and the wings transform themselves into wheels when the 

 machine rims along the ground. I have no record of the actual success 

 of either Merritt's or Liebrand's inventions, or even of their trial. 



Returning to the realm of actual experiment, in Figs. 6 and 7 

 are shown views of Carl F. Myers's 'sky-cycle.' Of this Mr. Mvers 



Fig. ■_'. Santos Dumont's Dirigible Balloon (I). 



Fig. :'•. Santos Dumont's Dirigible Balloon ii< 



writes, under date of February 5, 1900, with the enthusiasm of the 

 inventor: 



''The sky-cycle, or gas-kite, is a hand and foot propelled air-ship, 

 provided with revolving screw-sails, vibrating wings, movable aeroplanes 

 and universal rudder — the objed of the entire equipage being to test 



