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This newspaper page contains 7 articles. Subscribers can read the full text of each article.
Newspaper
Indiana Progress
Location
Indiana, Pennsylvania, United States of America
Date
Aug 16, 1922
Page
12
The article explains how grid leak resistance in a three electrode vacuum tube, using a grid leak instead of a C battery, affects grid potential and plate current. It discusses how too low resistance prevents sufficient negative grid charge and causes weak output, while too high resistance allows excessive negative charging, approaching no grid leak, with impedance governing current.
A detailed description explains how positive grid potential attracts electrons from the filament, depositing negative charge on the grid. During the negative half cycle the grid becomes negative but does not shed electrons, gradually reducing plate current as an AC grid potential is applied. After the cycle ends the grid leaks charge slowly through a grid leak resistor, while internal plate impedance remains a tube intrinsic characteristic affecting telephone load impedance and current flow.
Amateur experiments with electric light wires as aerials exist after the bureau of standards declares the method feasible. Eastern engineers advise audion and crystal sets, warn of fuse limits, and outline safe wiring steps and precautions to prevent house power loss or shock.
Short flashes report the first national radio compass station on the Great Lakes now in service with others forthcoming to tame lake dangers. It notes Hammond and Chaffee invention for secrecy via characteristic waves and government detection to locate interrupters. England's amateurs face limits. UK has only 8000 licensed operators due to restrictions.
In connection with this series this department is for readers interested in radio who have questions they wish answered. Arrangements have been made with Park Lytle, head of the Radio Club of Indiana, to answer all problems arising from wireless work.
Notice announces a proposed incorporation of the Smicksburg State Bank under Pennsylvania law. A banking corporation with 25000 capital, five hundred shares of 50 dollars par, is to be formed by John L. Getty and others, with Prol or & Frit as solicitors, at Smicksburg, Indiana County, on October 4, 1922.
The Indiana Progress announces club rates for rural delivery subscribers including daily newspapers and leading weeklies and magazines at reduced prices. Subscription is $2.00 a year prepaid with cash. orders go to THE INDIANA PROGRESS, 36.00.
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