Popular science monthly . de with ultra-violet light, whiletransmittingthe infra-red. As the cam-era reveals it,the infra-redworld is asstartling as theultra-violetworld. The skyappears inphotographs asblack as mid-night ; foliagesnow whit shadowsare intenselyblack, simplybecause most ofthe light comesdirectly fromthe sun and notfrom the sky. Applied topurely scientificinvestigationthis utilizationof infra-red andu 11 r a-v i o 1 e trays has vastpossibilities. Ihave madephotographicstudies of theheavenly bod-ies with invisible rays, and the resultsobtained prove convincingly that manynew
Popular science monthly . de with ultra-violet light, whiletransmittingthe infra-red. As the cam-era reveals it,the infra-redworld is asstartling as theultra-violetworld. The skyappears inphotographs asblack as mid-night ; foliagesnow whit shadowsare intenselyblack, simplybecause most ofthe light comesdirectly fromthe sun and notfrom the sky. Applied topurely scientificinvestigationthis utilizationof infra-red andu 11 r a-v i o 1 e trays has vastpossibilities. Ihave madephotographicstudies of theheavenly bod-ies with invisible rays, and the resultsobtained prove convincingly that manynew facts can be reached in this way. The Moon is a dead, arid, airlessbody which has long ceased to interestmost astronomers. Every one of itsmany thousand extinct craters has beenplotted; its great mountain ranges haveall been named; and its so-called seasand basins have been mapped. Itseemed impossible years ago to addanything substantial to our knowledgeof the Moon. I made some experimentsat my summer home on Long Island. Photograph taken with infra-red light. Note the black sky, the white trees silhouetted against it, and the deep shadows radiation alone,there is enoughthat is signifi-c a n t. Thebrightest of allextinct lunarcraters is ultra-vio-let rays, Aris-tarchus showsa dark patchwhich is not tobe seen on aphotographmade with vis-ible light. Imade an en-largement ofthe region inwhich this cra-ter appears,and it is evi-dent that thereis in its neigh-borhood a largedeposit of somematerial whichcan be revealedonly by ultra-\ i o 1 e t photo-graphs of theMoon provethat by systematically stud>ing the lunarsurface with invisible rays, we maysome day discover what the Moon ismade of almost with as much certaintyas if we could analyze a piece of it inan earthly laboratory. In the late autumn of last year,through the courtesy of Professor Hale,the great sixty-inch reflecting telescopeof the Mount Wilson Obscrx-atory inCalifornia wa
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
