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RADIO BROADCAST
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© Undenvood & Underwood ONE OF THE ATTRACTIONS AT THE NEW YORK RADIO SHOW E. R. Glavin with his wireless controlled wagon which ran about delivering mail and papers
Radio and the French Farmer
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ETEOROLOGICAL forecasts to twelve districts in France are now being sent daily from the Eiffel Tower for the benefit of farmers. They will indicate the weather for the following day, the direction of the wind, the state of the sky, and the possibilities of dangerous phenomena for agriculture, such as frost, storms, hail, and so on, and the variation of temperature. The messages will be transmitted at 4:30 p. m. daily, and in summer it is intended to send a second message at daybreak. This will contain the same information, only the minimum temperature of the night will be replaced by the maximum temperature of the day.
Atmospheric Conditions and Radio
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ETHODICAL experiments for discovering a relation between atmospheric conditions, particularly atmospheric pressure, temperature, dampness, wind, potential gradient, number of ions, atmospheric current in the antenna, and so
on, and the quantity and intensity of atmospherics, as well as fading of signals, were made by S. WiedenhofT, a German investigator, and are reported in a recent issue of a German technical periodical. The chief conclusions are as follows: (i) The maximum variations in atmospherics are observed when the variations of the potential gradient are minimum and when the atmospheric current in the antenna and the number of ions in the air are maximum. (2) In general no atmospherics, or only a few, are experienced in conditions of dry fog, but they immediately appear so soon as fog is dissipated. (3) Rain, diminution of potential gradient and of the number of particles of dust produce great atmospheric disturbances. (4) Increase of atmospheric current in the antenna produces a sensible diminution of atmospheric disturbances.
So far as the regular and periodic variations in the intensity of atmospherics in day time (maximum in the afternoon, minimum in the morning), and during the year (maximum from June to September, minimum in February) are concerned, the following conclusions were arrived at: (i) The largest number of atmos