Figure 99. 

 Sivel, Tissandier, and Croce-Spinelli in the car of 

 the Zenith, Sivel preparing to cut the strings of the 

 ballast bags at 300 mm. barometric pressure. Croce- 

 Spinelli with the bubbling arrangement for breathing 

 oxygen in his hand. Tissandier reading the barometer. 

 The oxygen bags are seen above the car, and the re- 

 versible aspirator fixed to the basket work. 



