Popular science monthly . A photograph taken with ultra-violet light reveals no shadows. White objects appear black, and everything seems veiled in a thin fog uency of vibration. SoLow \ibrations mani-as red colors; high vibrations asviolet as there isa perfect musi-cal octave com-prised of noteseach having adefinite pitchor frequency ofvibration, sothere is a lightscale, manifest-ing itself incolor notes,each also hav-ing a definitepitch or fre-quency. Butwhile the fre-quency of the\ibrations thatproduce musi-cal notes ismeasured atthe most bythousands per-ccontl, the vi-brations th
Popular science monthly . A photograph taken with ultra-violet light reveals no shadows. White objects appear black, and everything seems veiled in a thin fog uency of vibration. SoLow \ibrations mani-as red colors; high vibrations asviolet as there isa perfect musi-cal octave com-prised of noteseach having adefinite pitchor frequency ofvibration, sothere is a lightscale, manifest-ing itself incolor notes,each also hav-ing a definitepitch or fre-quency. Butwhile the fre-quency of the\ibrations thatproduce musi-cal notes ismeasured atthe most bythousands per-ccontl, the vi-brations thatmanifest them-selves to oureyes as lightmust be meas-ured by trillionsper second. There aresounds so thinand shrill, sohighly pitched that only sensitive earscan hear them. Beyond them are notesthat no human ear can hear at all. 89 90 Popiilar Science Mvnthhj. The infra-red world is as strange as t±ie ultra-violet. The sky appears black, foliage abeautiful rich red, and there are long, heavy shadow;s With light it is the same. There arcoctaves of light which our eyes cannc\-er hope to see. Perhaps the bestknown of invisible rays are those used inwireless telegraphy; they arc produced1)\- vibrations of far lower frequencythan those which we see as sunlight. When you strike the middle C ona piano you hear a single musical so, when you look at the worldabout you through a pane of red glass,you sec things in a single light-note, asit were. Change the color of the glassand the world apix-ars different. Thesame trees, the same flowers, the samehouses are there, but with one colordetails are obscured and with anotherintensified. It is perfectly pf)ssiblc to view theworld with in\isible rays and to learnthings about which we never dreamed ofin our philosophy—only we must usean eye, which, unlike our own e\-es, willsee the unknown world
Size: 1813px × 1378px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
