COLOR MAGIC WITH POLARIZED LIGHT
By E. W. MURTFELDT
BLAZING with brilliant, ever-changing colors that rival the hues of the rainbow, the illuminated face of a giant electric clock is attracting crowds to an exhibit of timepieces at the San Francisco World’s Fair. Visitors, curious to know how this spectacular effect is obtained, are amazed to learn that this gleaming disk of light, sparkling with an intricate, moving pattern of colorful stars and concentric circles, is produced not by any complicated arrangement of colored bulbs, projectors, and revolving niters, but merely by plain white light, and strips of transparent cellulose mending tape sandwiched between two practically colorless disks.
Hot Water From Waste Lamp Heat
ILLUMINATION engineers are well aware of the deplorable fact that no device wastes energy like an electric light. Only 4 to 5 per cent of the “juice” is transformed into light, the remaining 95 per cent being wasted in useless radiant heat.
Now comes a Swiss engineer with an invention which puts the wasted energy to useful work. He makes the radiant heat operate a midget water boiler built around the bulb, as illustrated in the photo below.
The glass boiler encasing the bulb holds about a quart, which may be brought to a boiling point in 40 minutes.
Clock Tells Time from Any Angle
Fitted with specially designed numerals, a novel clock makes it easy to tell time no matter at what angle the timepiece is viewed. Hour numbers are lettered on both sides of projections from the clock face, which are shaped like wedges of cake. Thus the numerals can be seen from an angle far to the right or left of a position directly in front of the clock face.
“Lightning Does Not “Photograph” Scenery on Skin, as Tradition Believes”
All this time that’s been Lightning’s best tactic with the girls: “I’m a photographer” , “the nudity is for art’s sake.”.
Oh Lightning, you’re such a player.
Lightning – Playboy of the Storm Skies
by Calvin Frazer
Do you know what “black lightning” isâ€”how lightning creates fertilizer for the fieldsâ€”which legends about it are true and which ones false? This fascinating story of lightning’s vagaries reveals it as playing odd pranks on human beings as well as causing fires and destruction.
ACCORDING to a recent estimate, about 100 flashes of lightning occur each second, on an average, in the entire world. Except in some uninhabited parts of the polar regions, there is no place on earth where lightning is entirely unknown, and there are portions of tropical Africa where it is seen on more than two hundred days every year.
Dart-Shooting Fish Gun Has Pistol Grip
Angling with a dart gun, a sport that has steadily increased in popularity, especially along the shores of the Mediterranean Sea in France and Italy, is expected to be improved by the recent invention of a fishing gun that is fitted with a pistol grip so that the weapon may be aimed and fired like a rifle. Placed midway along the length of the gun, which resembles a hollow fishing rod, the pistol grip has a trigger for releasing the spring mechanism to fire a sharp, dartlike projectile that drags a line in its wake from a reel mounted a short distance in front of the grip. The weapon may also be used under water, when the angler wears special goggles that enable him to see the fish.
Gym Horse From Hot Water Tank
A GYM horse that can stand the weather and delight youngsters can be made and set up in half an hour by the method shown in the accompanying photograph. The pipe is readily driven into the ground, after connecting to the tank, of course. A little concrete may be poured around the pipe afterwards if greater rigidity is desired.
Yup, global warming is a just a crazy, new theory.
Carbon Dioxide Heats the Earth
DR. E. O. HULBURT, physicist of the naval research laboratory, Washington, has found conclusive mathematical evidence that the earth’s temperature is being warmed by the increased amount of carbon dioxide present in the air. Smoke stacks emit huge volumes of this gas, which is also found in the breath and waste products of humans and animals.
Shutting Hell’s Mouth
SCREAMING sacrifices to strange gods, corpses of medieval victims of persecution, even the grisly results of Chicago gangster activities have hurtled down to oblivion in the gaping earth slit that is called The Mouth of Hell. That’s all over now, for the citizens of Taxco, 105 miles south of Mexico City, have, with the help of an American and a Mexican engineer, sealed it up forever. Formerly believed to be a mile deep, the hole has been shown by scientific measurements to go down 475 feet. To remove this relic of barbarism, heavy timbers were braced on jutting rocks a few feet below the orifice; when dynamite charges were set off near the surface, tons of rocks keystoned across the horror hole, closing it for all time. The operation, which cost about $500, was undertaken after exhaustive exploration by Dr. Ezequiel Ordonez, leading Mexican geologist, and other scientists.
How a Fireworks Magician Tames Dynamite
Flaming dynamite and exploding mortars are the chief tools of the fireworks expert. In this vivid, intimate story one of the aces of the fireworks army takes you behind the scenes to reveal, for the first time, the thrills and dangers of his roaring trade.
MILLIONS of Americans thrill yearly to the glittering wheels, flaming rockets and spectacular bombs of the giant fireworks displays; but the men who fire them are the men nobody knowsâ€”the world’s most mysterious showmen.
This scares me.
If You Have Not Already Enlisted in the Great Army of U. S. Savers, TODAY is the Best Time to Begin
What Your W. S. Stamps Do for Uncle Sam
A single Thrift Stamp (25 cents) will pay for a soldier’s identification tag, which may save him from an unknown grave. Two (50 cents) will buy a trench-digging tool which may save his life. One War Savings Stamp ($4.16) enables U. S. to buy a pair of shoes or a flannel shirt or a steel helmet which may save a soldier’s life. One War Savings Stamp ($4.16) will feed a soldier or sailor for a week or buy the gasoline for an hour’s flight of an airplane. Three stamps pay for an overcoat or a gas mask. One War Certificate filled with 20 stamps ($83.20) will feed the entire crew of one of our torpedo-boat destroyers on the day they catch a submarine.