12 Prof. Magnus on the Motion of Fluids. 



was situate, that the dii-ection of the jet, even through this short 

 distance, remained unaltered. 



29. To avoid this insecurity, the experiment was so modified 

 that the jet was vertical, and moved against a horizontal plate. 

 The plate was attached by three fine wires to one end of the 

 balance. The balance, however, was so placed that it could slide 

 up and down, the middle of the plate being preserved perpendi- 

 cular beneath the orifice through which the water was to pass. 



The plate was suspended in water contained by a vessel 3 feet 

 in diameter and 2 feet high, the level of the water being kept 

 constant. The orifice through which the stream issued opened 

 at a depth of 4 inches underneath the surface. 



In these experiments, also, a similar increase of the action 



against the plate was exhibited, both when the descending jet 



was exactly vertical, and when it struck the centre of the plate at 



an angle of 10°, as appears from No. 13 of the following table : — 



Vertical Jet. 



