Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 598
sformer. The rays pass througha narrow slit and each area in the photographs shown wasexposed 450 times (15 sec). Note the much greater in- Nov., 1921.] Advaxces in X-rays. 589 tensities at the higher vohage all other factors, znz., time, cur-rent, distance and development being the same. Note… … One half of the slit of Fig. i was covered by 4 mm. of aluminum. On a 6 gap only 14 thetime was given to the upper portion in order to nearly equalize the exposures. More of theradiation at the higher gap is able to pass through the aluminum. Fig.
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