. Robison's Manual of radio telegraphy and telephony for the use of naval electricians . evolution continues, that half of C D which during the firsthalf revolution was cutting lines of force in such a manner as to inducea current to the front, now cuts them in such a manner as to induce acurrent to the rear, its former place being taken by what was originallythe lower half, so that the direction of current in C D is reversed.(Eule c.) Another maximum rate of cutting lines of force and consequent maxi-mum of current is produced when C D has revolved through 270°, Thecurrent progressively incre
. Robison's Manual of radio telegraphy and telephony for the use of naval electricians . evolution continues, that half of C D which during the firsthalf revolution was cutting lines of force in such a manner as to inducea current to the front, now cuts them in such a manner as to induce acurrent to the rear, its former place being taken by what was originallythe lower half, so that the direction of current in C D is reversed.(Eule c.) Another maximum rate of cutting lines of force and consequent maxi-mum of current is produced when C D has revolved through 270°, Thecurrent progressively increases from 180° to 270° and then decreasesuntil when the original conditions are restored by the completion of onerevolution the current has again fallen to zero. From the above and from an inspection of fig. 17a it will be seen thatcurrent is always flowing to the front in that half of C D which is goingdown to the right and to the rear in the half going up on the left, andthat each half revolution the current changes in direction. Such a cur-rent is called an alternating Fig. 18. 34. This can be shown graphically in fig. 18, where the rate of cut-ting and therefore the rate of change of number of lines included in thecircuit at different equidistant points in one revolution is represented byequidistant vertical lines proportional to the cutting rate, and conse-quently to the current strength. Vertical lines above the horizontal linerepresent current strength in one direction and, below it, current strengthin the opposite direction. A regular curve is produced by joining thetops of these lines. This curve is the curve of sines, because the rate ofcutting and the strength of the induced current are proportional to thesine of the angle of revolution.* * Since the lines of force are horizontal, the number cut during the revolu-tion of C D through any angle is proportional to the vertical movement of theextremity of the radius of C D which generates the angle. The amou
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