<p><strong>Fig. 4.21.</strong> Wave tank set up for observing orbital wave motion. (This image is not to scale; the paddle, paddlestop, and ruler have been enlarged relative to the size of the tank.)</p>

Fig. 4.21. Wave tank set up for observing orbital wave motion. (This image is not to scale; the paddle, paddlestop, and ruler have been enlarged relative to the size of the tank.)

Image by Byron Inouye