NOTATION 



A, B Constants 



a, b, c Constants; semi-axes of ellipse or ellipsoid 



e Ellipticity of an ellipse 



F Force on a body 



F- Force per unit length on a cylinder 



/ Constant; sign of a function of a variable 



g A constant 



h A constant, real or sometimes complex 



/ Moment of inertia 



/' Equivalent moment of inertia of fluid moving irrotationally around or inside a 



rotating body 



(/') Symbol denoting that only the imaginary part of the expression following it is to 



be taken, with omission of the factor i 



k A real constant; inertia coefficient 



I, m, n Direction cosines, or constants 



M Mass of a body 



M' Equivalent mass of fluid moving aroupd a body that is in trans lationaBgriotion 



/W , iWj' Values of W, A/ 'taken per unit length of a cylinder, in cases of two-dimensional 



motion. 



N . Torque per unit length on a cylinder 



p Pressure in the fluid 



q Magnitude of particle velocity in the fluid 



q Component of the velocity in direction normal to a curve or surface 



?r' '?0' ?6) Components of velocity in the directions of polar coordinates r, (9, co 



q^ Component of velocity in the direction of the tangent to a curve 



q , q—, q Components of velocity in the directions of cylindrical coordinates x, To, co 



R Radius of a circle 



(R) Symbol denoting that only the real part of the expression following it is to be 



taken 



r A polar coordinate; in two dimensions, distance from a line; in three dimensions, 



distance from a point 



S Denotes a surface 



