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This newspaper page contains 14 articles. Subscribers can read the full text of each article.
Newspaper
Indianapolis Times
Location
Indianapolis, Indiana, United States of America
Date
Mar 19, 1925
Page
13
An article compares radio receiver wiring to human nerves, stressing insulation quality to prevent signal loss. It discusses conductor types, especially noting double cotton covered or double silk covered wires as best for reducing resistance and leakage, with enameled wire less favored for general coils.
Dayton March 19 Maj. Orin E Marvel radio engineer designs a stove pipe antenna a wire wound around a mast resembling a small smoke pipe He claims greater height selectivity and volume while replacing long wires easier to install
A report describes enamel insulated fine wire for variometer and variocoupler windings reducing distributed capacity and eddy currents. It recommends 60 strands of No 38 twisted with phosphor bronze, silk coverings, ground wire insulation, and battery leads using rubber covered braided conductors with No 14–18 B and S gauges. Continuous wiping contacts risk corrosion and resistance rise.
A reader notes a makeshift technique to secure a vacuum tube in its socket by inserting a tooth pick or a match whittled into a wedge to hold the tube tightly when the fit is loose.
A Philadelphia hotel equips 208 rooms with receivers and loudspeakers in the larger rooms. A telephone operator manages reception for guests.
A dying vacuum tube becomes noisy and distorts music as power to detect and amplify wanes before burnout. The symptom is a gradual volume drop and fading distant stations, followed by a rapid volume decrease.
Pry cell B batteries are rated by ampere hour capacity and weight. The same voltage may be delivered by one three or five pound batteries, but the heaviest units provide voltage over the longest period.
The University of Wisconsin launches a weekly radio lecture series on home problems airing Mondays at 7:45 PM on WHA. Mrs Nellie Kedzie Jones leads the program as head of the home economics extension work in the college of agriculture.
Every Monday evening WHA radio at 7 45 broadcasts a lecture in a home making food problems course. The station offers correspondence study options and ongoing lectures as part of the series.
Washington reports from Dayton Ohio say two Army aviators communicated by radiophone while in flight and five miles apart. Both aircraft carried broadcasting and receiving gear for test use. War Department aims to equip all planes for in‑air conversations. Instructions describe threading wire through three holes with spaghetti used as a spacer to form loops.
Copper is the best wind of wire for headphone coils due to its low resistance. Windings require many turns of very fine wire, typically insulated with enamel to protect the coil.
The article explains radio practice basics such as indoor aerial use a piano works well for indoor reception prices range from 14 to 5000 dollars and stranded bare copper wire is suitable for aerials A single wire is enough A permanent magnet retains magnetism if steel is placed across poles Grounding matters shield dials back to reduce body capacity and tin foil should ground to the rotor of the condenser Poor ground connections raise loss of selectivity by increasing aerial resistance and broadening tuning
The country’s smallest broadcasting studio is now run weekly by WJJD Chicago at a famous cafe in Moose Heart Ill. From this site entertainments are broadcast to listeners across the area.
The article explains testing alkaline battery charge with a voltmeter rather than a hydrometer. Each cell is 1.4 volts when fully charged and drops to 1.2 volts during use, indicating its discharge level.
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