. The Bell System technical journal . centage of words cor-rectly received during one unit test period. In many of these teststhe interference was noted to be caused by radio telegraph stations,and the data in which the interference is of this character, in so far asidentified, are indicated by the triangular dots. It will be seen thatmost of the poor receptions were due to this cause. Especially isthis true of tests at 12 noon at which time severe interference fromsources local in London was experienced. The circle points are the 142 BELL SYSTEM TECHNICAL JOURNAL average of results for each h
. The Bell System technical journal . centage of words cor-rectly received during one unit test period. In many of these teststhe interference was noted to be caused by radio telegraph stations,and the data in which the interference is of this character, in so far asidentified, are indicated by the triangular dots. It will be seen thatmost of the poor receptions were due to this cause. Especially isthis true of tests at 12 noon at which time severe interference fromsources local in London was experienced. The circle points are the 142 BELL SYSTEM TECHNICAL JOURNAL average of results for each hours tests. The dash line curve is asmoothing out curve of these points. It is interesting to note that these curves of actual word countconform very well in general shape with those of Figs. 11 and 12which also really measure receptiveness although in a less directmanner. Reception is best during the late night and early morning, Transatlantic Radio Transmission Measurements Diurnal Variation of Words Understood Jan. I-Feb. 25, 10 1lf2M 1 Each circle is average of all tests for that hour includingtriangular points. The latter are known to be cases inwhich low percentage is due to unnatural causes. Fig. 13 drops off during the day, reaching a minimum during the , the night reception is shown to be considerably betterfor the January-February period than for the February-March curve of Fig. 14 corresponds quite closely with that of Fig. curve of Fig. 13 does not show as much of a peak as does that ofFig. 11 which is, of course, due to the fact that above a certain ratiothe percentage of words understood is high and cannot rise above 100per cent. Conclusion As has been indicated this is a report of work which is still in date: A new type of radio telephone system affording important ad-vantages for transatlantic telephony has been developed and putinto successful experimental operation across the Atlantic. Sustained one-way te
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