Prof. Magnus on the Motion of Fluids. 

 Horizontal Jet^. 



11 



In tliia plate, dia- 

 meter 3 millims. 



The same. 



Vertical 

 pressure. 



metres. 

 2U5 



The same. 



Diameter 

 of plate. 



Distance of 



the plate from 



the orifice. 



millims. 

 100 



150 



In brass 1 millim. 

 thick, diameter 3 

 millims. 



Small glass tube, 10 

 millims. long, dia- 

 meter nearly 3 

 millims. 



2-229 



The same. 



Small glass tube, 20 

 millims. long, dia- 

 meter a little un- 

 der 3 millims. 



The same. 



200 



millims. 

 20 

 50 

 100 

 150 

 200 



20 



50 



100 



150 



200 



250 



300 



20 



50 



100 



150 



200 



250 



Weight in grammes 



necessary to bring the 



plate to its place. 



No. I. 

 200 

 210 

 21-5 

 21-5 

 210 



No. 2. No. 3. 

 20-0 200 



210 

 21-5 

 21-5 

 20-5 



2075 

 21-5 

 21-5 

 20-5 



No. 4. No. 5. No.Gf. 



200 200 18-0 



210 210 190 



220 22-5 200 



230 23-5 200 



230 235 210 



230 230 210 



22-5 22-5 20-5 



150 



The same. 



20 



50 



100 



150 



200 



250 



20 



50 



100 



150 



200 



No. 7. 

 160 

 16-7 

 180 

 18-0 

 180 

 17-5 



No. 8. 

 16-2 

 16-7 

 180 

 180 

 180 

 17-7 



No. 9. 

 21-0 

 21-6 

 23-2 

 23-3 

 23-3 

 23-2 



No. 10. 

 14-3 

 14-9 

 15-2 

 15-4 

 152 



28. From these experiments, it appears that the action against 

 the plate, up to a length of 150 millims., increased with the 

 distance from the orifice. A similar result was obtained from 

 all the experiments. Not one (and several have been made which 

 are not here described) showed a decrease within the distance of 

 100 millims. But the increase was not always equal; and I 

 convinced myself that the inequalities were to be attributed to 

 the impossibility of so attaching the collar in which the orifice 



* In these experiments the temperature of the water altered very little ; 

 it was very near 14*^ C. 



t In this series of observations the direction of the collar was a little 

 chanf^ed, so tliat the axis of the jet was not quite perpendicular to tlie sur- 

 face of the plate. 



