T Kinetic energy of the fluid 



T In two-dimensional motion, kinetic energy of the fluid between two planes of 



flow unit distance apart 



t Time; also, an auxiliary complex variable 



V Uniform stream velocity at infinity; velocity of translation of a body 

 u Component of velocity in the aj-direction 



V Same as V but always specifically parallel to the y-axis 



V Component of velocity in the y-direction 



w In three dimensions, component of velocity in the 2-direction; in two dimensions, 



w = cj> + iifj 



Components of force on a body 



Components of force per unit length on a cylinder 



Cartesian coordinates 



In three dimensions, the third Cartesian coordinate; in two dimensions, z = x + iy 



Constants, usually angles 



Circulation around a curve or about a cylinder 



An angle 



For two dimensions, a complex variable; ^ = A - z/z in sees 88-90, ^= ^ + i-q in 

 sees. 81-86 and 106, and (^ = - dz/dw in sees. 111-117; for three dimensions, a 

 spheroidal coordinate in sees. 137-138 



An elliptic coordinate in Sees. 81-86, 106 



An angle 



A special coordinate in Sees. 88-90, 136, 141 



Parabolic coordinates in Sec. 87 



ft Moment of a point dipole, or moment per unit length of a line dipole; a special 



coordinate in Sees. 88-90, 107, 136, or a spheroidal coordinate in Sees. 137-138 



1/ Dipole strength per unit length in Sec. 132; a special coordinate in Sees. 107, 136 



^ An elliptic coordinate in Sees. 81-86 and 106 



CO Distance from a line, sometimes used as a cylindrical coordinate 



p Density of the fluid, in dynamical units 



<;6 Velocity potential 



