. Bell telephone magazine . would travelin a straight line. However, as the center ofthe pipe curves away from the beams path,the beam encounters gas of decreasing re-fractive index. This region acts like a prism,deflecting the light beam in the direction ofthe pipes curvature. The sharper the curve,the more the light beam must be focusedto keep it from hitting the side of the a pipe, following the natural curvesof terrain, could be the transmission linefor a long-distance laser communicationsystem. These and other types of gas lenses cur-rently being investigated at Bell Laboratorie
. Bell telephone magazine . would travelin a straight line. However, as the center ofthe pipe curves away from the beams path,the beam encounters gas of decreasing re-fractive index. This region acts like a prism,deflecting the light beam in the direction ofthe pipes curvature. The sharper the curve,the more the light beam must be focusedto keep it from hitting the side of the a pipe, following the natural curvesof terrain, could be the transmission linefor a long-distance laser communicationsystem. These and other types of gas lenses cur-rently being investigated at Bell Laboratoriesrepresent a basically new approach to theguiding of light beams over long much has been done, many featuresmust be further investigated. Further timeand development will provide the test ofwhether a commercial system for long-dis-tance transmission of information will uti-mately evolve from this and related work. Bell scientists experiment with helicali;(is convection lens to i;i(i(le liiser
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
