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Show ! Instantaneous photography has corrected many false notions which were once held In regard to rapid movements. The ere was deceived by the Impression made ; upon it. Many readers are aware that the movements of a horses feet and lees in runing and lamping were not understood by artists untlll the exact postures were caught Vy the camera. No object has ; caused more discussion on the question whether or not we can trust the evidence of our senses, than the flash of lightnlnr. I In almost every Instance and to almost every eye, the bolt seems to descend br a zigzag course. Artists always represent " the flash under the form of broken line The ancient Greet artists snowed the tbundorbolt of Jove as. furnished with points tne shaits of which were zlezae sines. This proves that the human evt has given the sime testimony la regard, tou- 4 -.ri . the matter ror thousands of year S T." r how tnat instantaneous paotoeranhv shows us that the discharge from the clouds, like that from one eide to the other oth-er of a Leyden Jar, is In nearly a straight line, the problem is to account for the appearance ap-pearance which this line presents. One of tho most p'auslble explanations yet alven is by a recent contributor to Mature Tne theory of this writer Is that tho common 'streaming" flash, for example is seen by us projected upon rotting mass! es of cumulus clouds forming a background back-ground agaln3t which the ligbt is seen. As most thunder-storms are made up of such clouds, a background of that sort la uot of ten wanting. To test the theory, and to see if the eye i capable of correcting its own blunders, we should watch a flash from ita start t the ground. Usually the clouds are piled In loose fleeces above, and there the flash should appear zigzagged, while in Its lower low-er course, against a background of rain, it should appear crinkled. If it could only, on-ly, be seen against a clear sky, its real path would at once be dlscoverra. Youth Companion. |