On some Effects produced by a Fluid in Motion. 37 



lision with the water in the tube ; and by reducing the diameter 

 of the lower orifice of A, so as to diminish the efflux, the collision 

 could be made to take place at any distance from the orifice of C. 

 Before diminishing the efflux, the collision occurred at 8 inches 

 from C. 



Half a litre of air was 

 carried down in 

 Collision 8 inches from the orifice of C . min. 50 sees. 



99 99 99 99 1 99 " if 



99 99 99 99 ■ *' 99 1* 99 



01 „ „ „ . 4 „ 45 „ 



„ OJ „ „ „ no air carried down. 



II. A tube 2 3 o tns °f an i ncn diameter, drawn out in the form 

 of a converging cone, so that its orifice was ^ths of an inch 

 diameter, was substituted for the delivery-tube C : it delivered 

 half a litre of water in 33 seconds, and the stream broke up at 

 8 inches from the orifice. 



Before diminishing the efflux fromA, the stream struck against 

 the curved part of the tube, and half a litre of air was carried 

 down in 4 minutes 35 seconds. 



Half a litre of air was 

 carried down in 

 Collision 10 inches from orifice of delivery-tube min. 46 sec. 

 7 

 5 

 3 

 2 

 0* 



III. A tube ^ths of an inch diameter, drawn out in the form 

 of a converging cone, so that its orifice was yj^ths of an inch 

 diameter, was substituted for the delivery-tube used in the pre- 

 ceding experiment : it delivered half a litre of water in 68 se- 

 conds, and the stream broke up at 12 inches from the orifice. 



Before diminishing the efflux from A, the stream struck against 

 the curved part of the tube, and half a litre of air came over in 

 6 minutes 40 seconds. Half a litre of air was 



carried down in 

 Collision 10 inches from orifice of delivery-tube 1 min. 55 sec. 



" 99 99 99 99 2 „ 46 „ 



» * 99 99 99 99 3 „ 12 „ 



IV. A tube 20 inches long and - 2 ^ths of an inch diameter, 

 curved at its lower end, was substituted for the tube A, and a 

 stream of water flowing from the delivery-tube used in Experi- 

 ment II., at the rate of half a litre in 33 seconds, was allowed 

 to flow down the axis of the tube. 



Before diminishing the efflux from the vertical tube, collision 



99 



99 



99 



99 



99 



99 



99 



99 







99 



46 







99 



52 



1 



99 



10 



1 



99 



31 



2 



99 



7 



