OCR Text |
Show PUotojmphlnc tlie Aurora Ito real J. Dr. Kayscr has succeeded in obtaining a photograph of the aurora boreal is from thesumiuitof Mount itigi in Switzerland. This ' is nn interesting fact, it having hitherto leon regarded us inqiossible to photograph the aurora for want of a-plate BUliicienlly sensitive u K- impressed by its rays. Guntlicr. in his well known physical physi-cal geography, declares it to be utterly inix)Nsihe to phutograpb the aurora, the most carefully prepared plate remaining neutral when exposed to the aurora's rays. Dr. Kayser resorted lo special precautions und employed u colored dry plate tlio uzuliu trocken-platte, New Orleans Picayune. |