312 



PHENOMENA OF SUCTION. 



is suspended to the other by three threads ; the distant 

 between both discs should be 10 mm . If air is strongb 

 blown through the tube, it will expand between tht 

 plates in a radiating manner, as shown by the arrow; 

 in fig. 204, B, and the particles of air will tend tomov 





Fio. 204 (an. proj. real size ; B. real size). 



with the same velocity ^ that is, a particle at b tends t 

 reach c in the same time in which it moved from a to < 

 and to pass from c to d again in the same time, and so 01 

 But if the particles of air are to maintain the sam 

 velocity, then the same quantity of air which at an 

 instant fills the space within the circle 1, will in th 



