William T. Tilden,
The Art of Lawn Tennis
“ The racquet has struck and passed over the ball, topping it. The body is at right angles to the net, the left arm extended to aid in perfect balance. The whole movement is forward, while the eye is on the ball, in its flight. The stroke in the picture was off a high bounding ball which accounts for the racquet's position being above the wrist in order to bring down the ball. ”
