Popular science monthly . utedthat only one letter of the alphabet canaffect them. Down inside the voice-operated part of the machine these cellswill be erected to receive waves comingfrom the vibrating mirrors when a personspeaks. The selenium cells within themachine are arranged to correspond tothe characters of the natural alphabet(see chart of these, page 68). If anordinary rotating mirror be placed inthe path of the light beams coming fromthe vibrating mirrors, it will auto-matically spread out these beamsfrom the straight line (such as is shownon the selenium tx-ll of the figure onpage 6
Popular science monthly . utedthat only one letter of the alphabet canaffect them. Down inside the voice-operated part of the machine these cellswill be erected to receive waves comingfrom the vibrating mirrors when a personspeaks. The selenium cells within themachine are arranged to correspond tothe characters of the natural alphabet(see chart of these, page 68). If anordinary rotating mirror be placed inthe path of the light beams coming fromthe vibrating mirrors, it will auto-matically spread out these beamsfrom the straight line (such as is shownon the selenium tx-ll of the figure onpage 67) to their natural wa\e shape(that shown on page 68)—this on thesame principle that physics teachers ofold used to spread out sound vibra-tions on a screen, using a revolvingmirror. The spread-out \ibrationsare intended to fall each on its ownselenimn cell in the base of the machine,and because of this falling on the jiroperselenium cell, to alTect the correspt)nilingt\ new ritcr ki\. he Feminine Gender of Preparedness. At left, women seatedat desks learning theroutine of the field tel-egraphers work. Thiswas easy comparedwith retiring at nine-thirty oclock andthrowing out of camp avender of bathtubs Below, one of the ex-ercises that formed aregular part of thedays work. Twoweeks of this and thewomen soldiens wereconsidered fit
Size: 2040px × 1225px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
