GET WEATHER BY OWN WIRELESS
Greene, G. W.
Get Weather by Own Wireless Unique System Being Built Up to Advise Rural Communities of Storms; May Attend Concerts by Air Telephone By G. W. GREENE OVER thirty Wisconsin stations are already...
...The additional cost of this piece of apparatus is about $15, exclusive of a 6-volt storage battery for use on the grid circuit...
...From one to four strands of wire, raised 30 feet from the ground, and perhaps 150 feet long, will work very satisfactorily...
...The report is then sent out by wireless telephone...
...Many farmers now own a battery suitable for this purpose...
...E. M. Terry, of the physics department...
...The telegraph (code) reports can be received for about 150 miles with this set...
...The International code is used...
...The final current, or message, which reaches the receiver and ear of the operator is thus much stronger than the original impulse from the detector...
...In sending out the Friday night concerts a 370 meter wave length is used...
...Longer-Range Set ATA total cost of about $100 a more efficient and longer range receiving sets, consisting of a one or two step audion amplifier may be installed...
...It not, all that can be said is that it is a small glass bulb, with the air exhausted, and a metal filament and a metal frid inside of it...
...The antenna necessary for a small receiving station need not be expensive...
...You came in so loud it sounded as if you were next door...
...Other schools do the same...
...With the single bulb audion the telephone messages can be received up to 60 miles...
...Weather flags are then hoisted and in this way the forecast is available to the people of that city long before the mail announcements arrive...
...These are: (1) by speech...
...When the range of a set is said to be 300 miles, that means that it can transmit and send messages 800 miles under the worst conditions...
...The university station is able to transmit and receive messages by three different signal systems...
...Telegraph code messages would be audible over 200 miles...
...The forecasts are received from the U. S. Weather bureau at the university...
...For receiving messages over longer distances a single bulb audion detector should be used...
...Both the weather reports and the Friday night concerts sent out by the station are received by stations as far distant as Kansas, New Jersey, and Texas, as well as by Wisconsin people...
...The tubes were also built here...
...Make Apparatus Here THE vacuum tubes used in sending the wireless messages at Madison were all designed by Prof...
...The whole family listened to your concert Friday night," he wrote...
...The greater distances over which it is possible to transmit at night is well shown by a letter recently received from a man in Kansas City...
...The concerts are sent out by wireless telephone each Friday night from 7:30 to 8. Generally phonograph selections are transmitted, but violin musk will be added shortly...
...The faint current set up in this bulb by the message is then relayed to another audion bulb, which acts as an amplifier (or booster) and then, perhaps to another...
...In such a set one audion bulb is used to act as a detector in receiving the radio message...
...2) by the note modulated system...
...Most of the receiving stations also distribute the forecast over the local telephone system...
...A small set, equipped with a mineral detector, a tuner, 'phones, and antenna will receive the wireless telephone reports over a distance of about 20 miles...
...The weather reports are sent out at 12:30 p. m. daily...
...The telegraph code messages can be received over a distance of 200 to 250 miles...
...In sending out the wireless weather reports a wave length of 800 meters is used...
...The last of these methods is the most efficient and has the longest range, but it also requires more expensive and elaborate apparatus at both stations...
...Variation in Range •T* HE range of a wireless sending or receiv-* ing apparatus depends a good deal on climatic conditions...
...Messages can be sent much greater distances with the_same apparatus at night than they can in the daytime...
...and (3) by the undamped, high frequency, high pitch system...
...It is then repeated several times at a close rate of speed so that any amateurs "listening-in" may be able to pick it up...
...May Attend Concerts by Air Telephone By G. W. GREENE OVER thirty Wisconsin stations are already receiving the wireless telegraph and telephone weather reports sent out daily from the wireless experimental station at the University of Wisconsin...
...Any farmer or other citizen, who is at all handy with tools and understands the fundamentals of radio communication, can build a receiving station for from $20 to $30, according to Malcolm Hanson, who is in charge of the station...
...If you know, you know...
...Explanation of the audion bulb is useless...
...Their construction was a difficult problem, due to the fact that they are made of glass and a nearly complete exhaustion of the air must be made...
...Such a set will receive the telephone messages over 100 to 150 miles...
...The report is first sent, in code, at a fairly good rate of speed...
...High School Gets News THE high school at Portage, Wis., has a wireless station which receives the weather reports each noon...
Vol. 13 • February 1921 • No. 2
