tomography to Discontinuous Motion of a Liquid. 137 



on the surfaces of the jets where the tangent has the incli- 

 nation 6 corresponding to each curve. It is only necessary 

 to join the points /3/3' on the curve and find where the line 

 meets the ordinate at the point a. It is easy to draw the 

 boundaries of the jets when a few points have been found, 

 because the direction of the curve at each point is known. 

 To get the left-hand branches the origin can be shifted to 

 the other edge and the positive direction across the strip 

 taken from right to left, so that a /3/3 1 are replaced by their 

 supplements. ^ier. 7. 



120 



150 



90 



-l-Oi 



60 



30 



f-0 



L 



Nomogram for y. 



We have drawn x and y nomograms for intervals of 10° in 

 0, but, for the sake of clearness, only the curves for multiples 

 of 30° are shown on tigs. 6 and 7. 



Phil. Mag. S. 6. Vol. 31. No. 182. Feb. 1916. L 



