Inverted speech and a secret language by reversal
The article explains how reversing speech frequencies creates an inverted language using an 8000 cycle carrier. It describes demonstration apparatus, how intelligibility is affected, and how reinversion can restore normal speech. It also notes practical limits and a second discussion on moonlight polarized light affecting drugs.
MENTIONED IN THIS ARTICLE
Scientific American
Clyde R. Keith
Keith
Illinois
Noises That Stimulate Workers Speed In Mechanical Tasks
A Northwestern University study summarized in Popular Mechanics shows noises like ringing bells and office clamor can double output on simple tasks such as typing. When thinking while typing, such disturbances cause confusion, though most people adapt to noisy surroundings during two hours of testing with a digit-entry exercise.
MENTIONED IN THIS ARTICLE
J. B. Morgan
Northwestern Uni- Pay
Erac
Morgan
Willow Mattresses Protect Levees by Willow Rod Weavings
The article describes using large willow rod mattresses secured to trees with cables along shorelines to reinforce weak levee spots and slow erosion on flood-prone banks. It cites Okeechobee drainage and flood protection methods including canalling and dikes, noting past hurricane damage and river erosion risks.
MENTIONED IN THIS ARTICLE
Lake Okeechobee
Florida
Okeechobee
Missouri
Ppi
Compass Plant Aids Travelers On Southwest Prairies
A plant growing in the Southwest prairies acts as a natural compass. First noted by General Benjamin Alvord, the compass plant carries leaves that face the rising and setting sun. In its second year it blooms with four to five large leaves, found mainly in the Mississippi Valley, aiding hunters and settlers in navigation during dark nights.
MENTIONED IN THIS ARTICLE
Southwest
America
Benjamin Alvord
Mississippi Valley
Alvord
Mystery of the Talking Head Illusion in Classic Magic
A historical illusion known as the Sphinx or Talking Head uses mirrors under a three legged table to hide a hidden man. A magician reveals a speaking head from a box while spectators see reflections of curtains and green baize, not the unseen performer beneath the table.
MENTIONED IN THIS ARTICLE
Talking Head
Sapsucker Bars Run Across the North American Woodlands
Article notes sapsuckers drill sap holes in maples birch and other trees forming orderly sap cups or bars. They visit these “bars” daily collecting sap and even tolerate a variety of insects and animals drawn to the sugary drink. The scene includes interactions with downy woodpeckers orioles warblers squirrels and ants as patrons and staff.
MENTIONED IN THIS ARTICLE
Sapsuckers
W. L. McAtee
Nature Magazine
Perone
Lord Baltimore
Also Mentioned on This Page
Moon
American Chemical Society
David I. Macht
W. T. Anderson
Baltimore
Mystery of the