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.
THE eternal battle between science and the elements will receive its supreme test in Italy's impending war with Ethiopia. Nature, which has enabled this oldest of kingdoms to maintain its independence against the inroads of the civilizing but exploiting white race, will be on the side of Haille Selassie's dusky warriors; and it is against nature that Mussolini's troops, armed with the latest death-dealing weapons, must pit themselves. Italy already occupies two narrow strips of lowland bordering the Red Sea and Indian Oceanâ€”Eritrea and Italian Somaliland. It took Italy seven years to conquer the former and twenty years to occupy the latter. The climate of both of these colonies is hot. They are steaming fever-ridden pest holes in the rainy season and almost waterless deserts in the dry. Of so little economic value are they that only 7,000 Italians reside there in normal times.
Weeds Shot With Electric Pistol WEEDS that mingle with the lawn grass have long proven obstinate foes to combat, yielding to most garden instruments only at the expense of considerable turf. Now, however, a new weapon has been devised which electrocutes them instantly. The weed electrocutor is built like a pistol, the barrel of which [...]
During disasters radio "hams" come to the rescue. They keep in touch with lonely outposts, with explorers, arid like sentinels in the night guard against death. by Clinton B. De Soto WHEN a roaring hurricane swept through Florida in September, unknown amateur radio operators became heroes in the midst of death and destruction. Through howling wind and pelting rain they tapped away on their low-power transmitters when telephone, telegraph, and powerful broadcasting stations failed. Their dots and dashesâ€”the language of the radio amateurâ€”hurtling through the ether flashed to the rest of the world news of the disaster and set the great task of relief into motion.
IF MEN WORE PRICE TAGS HOW WOULD YOU FEEL? Well, your boss thinks of you in terms of so much a week! You are worth this or that to him. How much you are worth depends uponâ€”YOU! You decide the amount chiefly by your abilityâ€”by your training. Why not increase the amount by increasing your [...]
FOR new Hallowe'en thrills, put on a mediumistic party with turban-bedecked medium, darkened room, spirit writing, tables floating in the air, and all the other tricks which fake spirit mediums use so successfully. The mere suggestion, on your invitations, that all weak-hearted persons should stay at home will insure a crowd.
by ORMAL I. SPRUNGMAN From odds and ends of discarded equipment 13-year-old Franklin Lee has built a remarkably complete scientific laboratory. A few of his many successful electrical projects are described in this article. NIMBLE fingers, an inventive mind, and. the urge to experiment have brought to 13-year-old Franklin Lee, Granite Falls, Minn., electronic wizard, a scientific research laboratory that would do credit to a college student of science. In the well-lighted interior of his garage workshop powerful homemade electric motors turn lathes and grindstones. Standing by in one corner, ready for instant use, is an electromagnet capable of lifting a hundred pounds. Transformers of different sizes and voltages hum merrily in their baths of cooling oil, while in one corner metal glows white-hot in a homemade electric arc furnace. From discarded electrical equipment, auto parts, and odds and ends of cast-away materials Franklin built them all.
ROLLING along railways of the world at greater than mile-a-minute speeds, streamlined trains are conquering time and space in an attempt to keep the traveling public from deserting the rails for airplanes and motor buses. Three choices have been offered to the jury of travelersâ€”the ordinary steam train running on faster schedules, the beautiful Diesel-powered streamliner, and the light weight steam streamliner in its gleaming new dress of chromium and brass. A fourth contestant recently entered the pictureâ€”a turbine-drive steam locomotive that may surpass all others in speed, safety, and comfort.