Show farm income continues rise allol 0 r chicas rass r me go oga A a EP 0 o woo to FOOD an fn coic ABOA ita acos IFE too io to 00 oo 5 prica civo AS QUOTAS TIIS two plo AD ate MET new cotto coop in 0 J 4 c c e lo 10 pools acel lo 10 LAST YEAR 6 0 u r 9 s T it A 6 W ECONOMICS the agricultural situation for the month of may alay is graphically repealed rete aled by the above map prepared by the bureau of agricultural economics V U S department of agriculture U so S scientists develop automatic weather sta stations eions washington modern developments in the field of radio transmission have made it possible to devise an automatic weather station capable of unattended operation for periods up to one month and possibly three months in the future at isolated locations such as mountains and islands according to the U S department of commerce the division of the bureau of aeronautics navy department pioneered in this field to meet the requirements of the navy aerologists the national bureau of I 1 tards ards department of corn com 4 r r f e developed an ingenious but simple transmitting apparatus for use in such stations an automatic weather station may be equipped to make and transmit measurements of barometric pressure ambient temperature and relative humidity wind velocity and direction rainfall and probably other factors each of the measurements noted may be indicated at a remote point by radio through the simple process of converting the deflection of the measuring instrument into a corresponding variation of electrical resistance si and translating the resistance variation into the variation of a modulation frequency on the emitted carrier wave the automatic radio weather station is an outgrowth of the used for making weather measurements at stratospheric altitudes and now in general use for years weather measurements have been made and transmitted automatically by the use of wire lines and received and interpreted at central and field stations the new mechanism worked out for the navy represents a modification of methods already devised for wire lines to accommodate their use to radio and make them more adaptable to radio technique |