Big Cities to Have COOLED Sidewalks
COOLING big cities by means of underground air ducts has long been the dream of inventors and sweltering citizens alike. A plan is now being seriously considered by a Chicago scientist, Dr. Gustav Eglov, of the American Chemical Society.
Dr. Eglov believes that huge refrigeration plants built at intervals of a mile and a half along city streets would rid the canyons between sky scrapers of humid hot air.
“Death Ray” May Outlaw War
A “DEATH RAY” machine is on exhibition at the California Pacific International Exposition being held at San Diego, Calif. It was invented by Prof. Harry May of London, England.
Prof. May feels that his new lethal weapon will be instrumental in outlawing war. He thinks that nations, knowing that such a weapon for quick destruction is available, will hesitate to attack each other.
And if the chick is a hermaphrodite it turns into a perpetual motion machine!
Will the Egg Grow Up to Be a Hen or a Rooster?
WHETHER an egg is a potential rooster or an embryonic hen can be determined, it is claimed, by a “sexometer” which may prove to be of value in the poultry industry, for when the sex of eggs can be told, it will be possible to send most of the rooster eggs to market and retain the hen eggs for the upbuilding of the home flock.
Planes That Go Straight Up OPEN NEW FIELDS FOR AVIATION
By Edwin Teale
AMONG the skyscrapers of lower New York City, a few weeks ago, a strange wingless craft drifted down in a vertical landing. Its wheels touched the concrete of a pier and rolled less than a dozen feet. With balancing wings eliminated, it represented the latest style in autogiros. The flying windmill has taken another step toward the goal of a thousand inventors, the helicopter.
An autogiro can descend vertically; but it can take off only after a run. A helicopter could get out of a field the size of its landing gear. It could climb straight into the sky, could hover like a humming bird, and could drop like an elevator descending its shaft. Entirely new realms of aerial travel await the perfection of such a craft.
Rotating Blades To Row Planes In Air
JUST as the propeller supplanted the paddle wheel, revolutionizing shipping, so are the new Voith-Schneider vertical feather-blades, successfully tested in Germany, expected to supplant the propeller.
The blades, mounted on a rotating disk, have been used for the past two years on river and harbor boats with marked economies in operation coupled with a decided increase in maneuverability. As the disk rotates, the blades present a full face on the back stroke, and then assume a feathered position for the return circuit. Steering is accomplished by an adjustment which delays the feathering movement, the open faced blades thus pushing the stern of the vessel to starboard or port as desired.
NEW LIFE PRESERVER HAS TWO PROPELLERS
Timid of sea travel because of his inability to swim, a Japanese lawyer of Los Angeles, Calif., has invented and patented a mobile life preserver. Hand cranks at the sides of the device turn a pair of diminutive propellers, enabling the wearer to advance at fair speed while remaining erect in the water. Thus a non-swimmer may reach a nearby shore without waiting to be picked up. The photograph above shows the inventor wearing his odd life preserver. Note the propellers and the hand crank that operates them.
New Rail Car Runs on Air-Electric Perpetual Drive
FROM coast to coast by rail in 24 hours, traveling literally on airâ€”that is what W. E. Boyette of Atlanta, Georgia, claims for his invention, a railroad engine that runs almost entirely on air.
Air for fuelâ€”speeds of up to 125 miles an hour on railsâ€”low transportation costs-â€”these are possibilities conjured by Boyette’s air electric car. After being started by batteries, the car needs only air to keep it runningâ€”a close approach to perpetual motion.
MERRY-GO-ROUND LAUNCHES AIRPLANE
Swung into the air from a merry-go-round launching device, a plane could attain flying speed without the need of a long runway, in a plan proposed by a Denver, Colo., inventor. The device consists of a tall mast with a revolving horizontal boom at the top, from which is suspended a hoop-shaped trapeze. When the plane has been attached to the trapeze and hoisted aloft, the pilot starts his motor. Then the plane revolves around the mast until flying speed is attained, and the pilot frees his craft from the device.
LOUD NOISES HELP THE DEAF
Based on the theory that exercise of the eardrums aids certain cases of defective hearing, Dr. J. B. Prager, of New York City, has devised a phonograph that subjects patients, through earphones, to loud noises. His records include dynamite explosions, the shrieking and clanging of fire engines, thunderstorms, and waves beating on rocks. Knobs on a panel resembling a giant radio set regulate the volume. The full blast of a fire siren may at first produce only a pleasant tingling in the ears, Dr. Prager reports.
Germs on Groceries Killed by Rays
Housewives now can return home from shopping with germ-free groceries. A new “germ-killer,” designed for use in food stores, bathes the groceries in ultraviolet light. The unit is a plywood box with a large opening at one end. Baskets or carts of groceries, contaminated by handling, are placed in the box through the open end. Inside are three ultraviolet lamps that pour “condensed sunshine” over the foods. After 30 seconds the foods are withdrawn germ-free.