1873] 



STREAM LINES 



a series of similar hyperbolas, whose centres lie on the 

 axis of y, whose axes are parallel to the co-ordinate axes, 

 and inversely proportional to the co-ordinates of the 



Case of two sources and two sinks giving three equal stream circles 

 with two points of zero flow. When a source and sink are transposed, 

 the lower circle is still a line of flow. The other lines assume the 

 dotted form. 



source, and which all cut the axis of x at points distant 



eft 

 - from the origin. Obviously one of the lines is 



