ntage curves, the values of which are tabulated in Table F. It etching around the black dots of the “ whites ” in contrast to that within the white dots of the is extremely interesting to note the interrelated changes that take place in the dimensions of the shadows. A name is ventured for each… … Fig. 15. — “ Periodic Acceleration.” illustrate these, Figs. 14 and 15 are used. In Fig. 14 four black dots, B, are shown; around these arrows are drawn, indicating the possible direction of acid activity around the dots, when there is little rocking and no brushing in the etch¬ ing tub. At the…
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