Electrical news and engineering . ty of the other appliances are only to be found in, on an average,from 5/( to 20^c of the homes in the United States and Canada. It is evidenttherefore, that there is plenty of scope for us all to do some real big businesswhich will benefit not only the jobber, dealer and central station, but assistin keeping our factories going. The writer was recently in California and noted the aggressive measuresbeing taken by the large departmental stores in featuring electrical ap-pliances ; splendid large window displays were in evidence and easy time pay-ments arranged
Electrical news and engineering . ty of the other appliances are only to be found in, on an average,from 5/( to 20^c of the homes in the United States and Canada. It is evidenttherefore, that there is plenty of scope for us all to do some real big businesswhich will benefit not only the jobber, dealer and central station, but assistin keeping our factories going. The writer was recently in California and noted the aggressive measuresbeing taken by the large departmental stores in featuring electrical ap-pliances ; splendid large window displays were in evidence and easy time pay-ments arranged for. The thought was left with me that if we who are en-gaged exclusively in the electrical game are to hold and extend the appliancebusiness, we must all face the situation squarely and adopt attractive meas-ures to gain an increased volume of sales and this, I feel sure, includes mak-ing it easier for the average family to purchase electrical goods. S. J. Halls,Manager Light & Power Department, Electric Rly. Co., THE ELECTRICAL NEWS Vacuum Tube Renders Possible HighDevelopment of Wireless Success Lies in Amplification of Electrial Impulses Previous articles of this series have dealt with the cnn-struction of radio sets without the use of amplification. Thesets discussed have been of an elementary type and thoughgenerally such arrangements are known to work well, rangeand clearness as obtained with them do not compare withthe results achieved using vacuum tube arrangements. The Edison Effect Edison. I-leniing and DeForest, among others, have donepioneer work resulting in the present apparatus. Thefirst named discovered that if a cold plate is placed insidean electric light bulb, and if the plate is connected to a bat-tery in such a way that it is slightly positive, an electric cur-rent will flow from the heated filament to the cold constructed a similar piece of apparatus known asthe Fleming oscillation valve. The introduction of a thirdmember into th
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