Word: periods
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Dates: during 1920-1929
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...hurricanes on the earth, have on the strength of the radio waves. By comparing the graphs of the sun spots and the radio reception we were gratified to discover that, invariably, as the number and intensity of sunspots increased, radio reception grew worse, until, at the peak of the period of sun spot activity, called the Sunspot Maximum, the radio signals reached their weakest point. Likewise, when the spots on the sun were fewest and weakest, the radio reception was best. For the measurement of radio reception we have made use of a superhetrodyne receiver with multiple stage amplification together...
...study of the graphs further shows that a rather definite fifteen month period in solar activity exists as exhibited by both spots and radio reception. This is one of the outstanding results of the investigation to date. Each of these sunspot sub-maxima have indicated increasing solar activity and it does not yet appear possible to state that we have reached the real maximum of the sunspot cycle until the sun peak of 1929 is reached and passed. The intensity of that peak will doubtless decide whether or not the maximum of the present sunspot cycle is reached...
...study of Queen Victoria, Strachey crystallized a period of history; in his portrait of Elizabeth he creates a symbol of sovereignty, withal flesh and blood...
...south of the Mexican border, Latin American telephone systems are now on a par with the U.S. systems of 30 years ago. Some of their equipment actually dates from that period. Important cities have no direct links; rural telephones scarcely exist. Around each densely settled community is spun a small network of telephones, having no relation to neighboring networks. In all Latin America, there is less than one telephone for each 100 inhabitants. The present U.S. ratio...
...holiday as one that embraces all creeds, all times, in a common human experience. It occurs at the time of the winter solstice, when the sun reaches its farthest point south, and the day begins to grow longer. Pagans throughout the world, in ages past, held festivals at this period. In ancient Rome at the Saturnalia (Dec. 17-21), windows and rooms were decked with holly wreaths; and at the Sigittaria (Dec. 22), it was customary to give presents, especially dolls, to the children...