. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . set up in the oscillating current is communi-cated to the grid, whose potential therefore alternatelyrises and falls. Suppose the potentiometer has been adjusted so thatthe steady potential of the grid is at A (fig. 38 B). Theoscillations cause the potential to rise to D and to fall toF; the rise and the fall being equal to
. Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development . set up in the oscillating current is communi-cated to the grid, whose potential therefore alternatelyrises and falls. Suppose the potentiometer has been adjusted so thatthe steady potential of the grid is at A (fig. 38 B). Theoscillations cause the potential to rise to D and to fall toF; the rise and the fall being equal to each other. Whenthe grid has a steady potential at A, the steady plate cur-rent is represented by the point E; when the first half ofthe alternation raises the grid potential to D, the platecurrent is increased to H; when the second half of the 294 RADIOTELEPHONY oscillation reduces the grid potential to F the plate cur-rent is reduced to G. It will be seen that the increase incurrent due to one half of the oscillation is much greaterthan the decrease due to the other half, for EH is muchlonger than EG and these two lengths measure the changein current. The result of this is that the current flowingthrough the telephone receiver is increased by an oscilla- Fig.
Size: 1324px × 1888px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
