Audio Amplification With Transformer Coupling and Three-Tube Set
A how to on one stage of transformer coupling and two stages of resistance coupling for audio amplification. It describes safe voltage step up, speaker-friendly distortion control, and specific component values for a homebrew set using UV and WD tubes, various grid leaks, and rheostats to manage three audio tubes and earphone operation.
Low Loss Space-Wound Coil Gives Results
A technical note describes a very low loss space wound coil with strong mechanics suitable for harsh conditions. It avoids shorting turns and high distributed capacity of basket weave and pickle bottle types. It covers wire gauges No 12 to 20, recommends No 16 or 18, and details winding on a bottle with gum tape, string, and rubber bands, finished with collodion coatings and tape removal.
MENTIONED IN THIS ARTICLE
Radio News
Distortion in audio amplifiers from unwanted transformer coupling
Distortion arises when input and output loads couple undesirably through transformers and tubes. A high pitched whistle or oscillation outside audible range may occur, limiting gain and causing poor fidelity. Remedies include grounding the filament side, reversing the first transformer primary leads, and shortening wire runs to minimize magnetic coupling.
Causes of Noises in the Belt Set
The article notes noises persisting after belt disconnection stem from imperfect contact in the phone cord, frayed cords with use, poor connections to the storage battery, worn-out dry cells, and dirty contacts.
Destructive Red Squirrel Noted by Ornithologists in Woods
Despite a pretty appearance the red squirrel is cited as one of the most destructive pests in the woods today. Ornithologists say its depredations among birds rank second to hunting cats, killing young birds and destroying eggs before hatch. Around firm buildings here considered a mut-
Liberal spacing guide for radio set assembly and wiring
The article discusses spacing and wiring tips for a radio set. It addresses gaps between tubes and transformers, short direct wiring, grid and plate leads, and negative bias from rheostat voltage. It suggests grounding transformer cores and notes transformer type affects efficacy. It also covers use of jacks for audio stages but advises against jacks in RF circuits.
Australian Women’s Banks Adopt All-Female Staff Plan
Australian Women's Banks Australia has adopted the American plan of separate banks for women, staffed entirely by women.
MENTIONED IN THIS ARTICLE
Australia
High birth rate sets Japan apart in vital statistics
The birth rate in Japan is higher than in any other country where vital statistics are kept, making it a standout among nations for population data.
MENTIONED IN THIS ARTICLE
Japan
Largest Orange Grove in Cuba
The largest orange grove in the world spans 2000 acres in Cuba, marking a standout agricultural landmark.
MENTIONED IN THIS ARTICLE
Cuba
Man of Genius and His Dogs in Meredith Memoir
In Mem ories and Notes of Persons and Places Sir Sidney Colvin portrays George Meredith conversing with his dachshunds Koby Bruno Pete and Islet. The text notes Merediths mix of courtesy and raillery with dogs and servants and James Barries anecdote of Meredith calling his dogs as he descends the path, joyful and singing.
MENTIONED IN THIS ARTICLE
Sidney Colvin
George Meredith
Meredith
Koby
Bruno
Pete
Kobold
Islet
Colvin
James Barrie
Hasty Buying Not a Fault of East Indians
An Ohio State Journal writer notes American salesmen face delays in India where buyers seek excuses for postponing decisions. A New York motor salesman told a Delhi man of wealth that prices would not fall for a year to close the sale, but the resident replied he planned a yearlong vacation and would review the cars upon return.
MENTIONED IN THIS ARTICLE
India
Ohio State Journal
New York
Delhi
Webster Ashburton treaty defined Maine Canada border
The Webster Ashburton treaty of August 1842 settled the Maine Canada boundary and split disputed lands, granting seven-twelfths to the United States and five-twelfths to Great Britain. It secured a stronger Canadian frontier with St Lawrence elevations, included anti-slavery provisions, and established mutual extradition of suspects.
MENTIONED IN THIS ARTICLE
Holland
Absurd Glory and Its Perverse Incentives
In a blistering line from Hellier Belloc quoted in the New Statesman, the urge to glory drives men to idolize trivial or vile things from wealth to ancestor wealth to hair color. The piece argues glory spurs bad art, corrupt architecture, foolish laws, and widespread social harm.
MENTIONED IN THIS ARTICLE
Llare Belloc
The
New Statesman
Morse and the Practical Tryout of the Telegraph
Skeptics labeled him in league with the devil while the first test message over the line declared What hath God wrought. Morse, a painter by trade, merged scientific ideas and devices from electrical pioneers and earned credit for the concept despite strong opposition to its acceptance.
MENTIONED IN THIS ARTICLE
Morse
The Cow-Tree of Colombia Its Vegetable Milk Story
A discussion of the cow-tree in Colombia describing how its bark is incised to release a white sap that resembles milk in appearance and taste. When evaporated gently this sap yields a marzipan like product with a mild aroma, as noted in the Wonder Book of Plant Life by Jean Henri Fabre.
MENTIONED IN THIS ARTICLE
Colombia
Jean Henn Fabre
Civic Club Presidents and Old Fashioned Etiquette
A fragment essay comments on early telescope makers struggles, gender roles in civic clubs, kitchen etiquette, and the belief that efficiency declined with talk. It also notes few snake stories this year and suggests vice presidents rarely ascend to the presidency, ending with a reflection on divinity shaping human ends.
Telegraph Fear Spread When Morse Demonstrated 1845
The inventor Samuel F. B. Morse first demonstrated the practical telegraph in 1845, terrifying many intelligent citizens and provoking widespread concern about the new technology.
MENTIONED IN THIS ARTICLE
Samuel F. B. Morse
Mrs Fuller Praises Pinkham Vegetable Compound
Walpole New Hampshire resident Mrs T H Fuller credits Lydia E Pinkham's Vegetable Compound with restoring her health after months of irregularity and pain she handled at home while caring for two babies. She endorses the product to friends and urges other women to try it. For sale by druggists everywhere.
MENTIONED IN THIS ARTICLE
Walpole
N. H
Lydia E. Pinkham
T. H. Fuller
New Hampshire
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