OCR Text |
Show RARE FLASHE8 OF LIGHTNING Peculiarity of the Fluid That Defies Analysis. Some rnro flashes of lightning i daily tery brilliant linear flaslif seem lo persist for n Hum and fade gradually On the bat kuronnd of the sky. In the place of (he flash ens then sihk ii yellowish greet) or reddish Imago of the flnsh wnnlug rapidly Detnlls can be distinguished In It which were Intlslble In the prlncpsl flash According lo M Totichii this Imago Is not merely In the retina for he has experienced the retinal Imaje, ii well an (he other Tho ritlnsl Image move with the eye th other doe not Thl nflerglotv has iieeo inmiHircd lo tho train of n mi' oi or n fuse, In nn Incandescent I rtrlr tllnmcnt and to u phosphoric mre Tho successive discharges of 1 1 Welly We-lly In u lightning flash arn ro our llm limit of persistence of lloa (about a tenth of an Inch) that flDhe appear to trouble, hut tho sain faet docs not, according lo Tourhct el plain tho luminous furrow above described, de-scribed, which ho refer to Incandescence Incandes-cence of tho element of tho mr (' rlod lo a high temperature by H electric discharge To provo this IK took a photograph of lightning ilurlaf a thunderstorm on April' 12 It hs Ihe aspect of n "ribbon flash tW I lo sny. a bright wavering edge t dim hand which ho thinks, represent repre-sent the afterglow caused by Is' candescent gas |