OCR Text |
Show ADVANCE Ojj' SCIENCE INVENTIONS AND DISCOVERIES GOING FORWARD. Safety Stop for Elevators the Best That Has Yet Been Devised Effective Ef-fective Plan for the Storing of Gasoline Oerrsied's Experiment. A Simple Safety Device. Gasoline, owing to its dangerous mature, is a product against which Insurance In-surance companies make stringent niles, permitting only a small stock to be kept in a building. To overcome over-come this a very ingenious device has been adopted by a concern in Kaugatuck, Conn. In the street in front of the store three feet below the surface, is placed a tank holding handle, gome corks in pieces the siz of fc cherry stone, a sewing needle, and a strip of zinc eight inches long by one-quarter of an Irch wide. After electrifying the needle with the help of the magnet, by rubbing it over the steel, always in the same direction, make the needle ?wlm on the surface of the water in the large glass by laying it on a narrow nar-row strip of paper. One end of the needle will point north. Place the teaspoon over the glass above the needle and pointing in the same direction. Tie the pieces of cork in a piece of linen and around the handle of the fork, and dip it into the salt water, while you place the teeth of the fork on one end of the teaspoon. tea-spoon. Place one end of the strip of znc on another place on the teaspoon, tea-spoon, while you dip the other end in the salt water without touching the pieces of cork. As soon as the zinc Is put in the water an electric current is formed, and the swing needle is forced out of its former position, to return to it as soon as the zinc is taken out of the water. Safety Stop for Elevators. Owing to numerous accidents caused caus-ed by the dropping of elevators in office and other buildings the laws coverning the erection of new build- - -4 ten barrels. This is filled with gasoline gaso-line through a manhole. From the lank runs a pipe Into the cellar and up to the store floor, where a force pump Is fastened to it. At the end of a force pump is a cock. When gasoline Is wanted the cock Is opened and the handle of the pump Is worked until the required amount is obtained. Then the cock is closed, preventing dripping. ;ngs and controlling elevators in cities now require some sort of a safety device to prevent the fall of a car or reduce the shock to a minimum should the cable chance to break. The apparatus illustrated in the drawing draw-ing is intended for use in old buildings, build-ings, where the saving of money is desirable, as well as for the equipment equip-ment of new buildings. The invention consists of a pair ol Transparence and Invisibility. Lord Raylclgh points out that perfectly per-fectly transparent objects are only visible by virtue of non-uniform Illumination. Il-lumination. The moment we arrive at uniform illumination they become absolutely invisible to the eye, a fact which forcibly illustrates our optical limitations. Professor It. W. Wood, of Johns Hopkins University, Baltimore, Balti-more, has devised a melhod by means of which uniform illumination can be obtained and transparent objects made to disappear. His apparatus consists con-sists of a hollow glass globe, the outer surface of which Is painted with Jlalmain's luminous paint, mixed with liot Canada balsam; inside is placed the o.ijcct, und (lie hollow is viewed through a small hole drilled In the coating. If the inner surface be exposed ex-posed to bright daylight, sunshine or electric light, and the globe be then ' taken into a dark room, a crystal ball, or the cut glass stopper of a decanter, placed Inside, will be found to be invisible in-visible through the aperture, a uniform uni-form blue glow filling the space, and only the closest scrutiny will reveal the presence of a solid object. Oerrsied's Experiment. An electric current running through a wire will change the posi- toothed racks, which are secured on opposite sides of the elevator well In proximity to the guide rails, together with the frame attached to that car and carrying a pair of spur gear wheels. Beneath the car will be seen a wedge-shaped projection, and it is this which stops the car when the cable breaks. The frame carrying the -wheel bangs normally low enough to keep the wheels out of touch with the wedge, but upon the breakage of the cable the car Is wholly unsupported and begins to fall rapidly, while the friction of the teeth In the racks retards re-tards the speed of the wheels, which eoou allows the wedge to drop between be-tween them. As this edge entars between be-tween the teeth it clogs the wheel3 and brings the car to a stop, supporting support-ing its weight on the racks on either side of the well. The inventor of this apparatus is William Fehler of Moun-tainville, Moun-tainville, Pa. Motion Through the Ether. Physicists have concluded that the earth in its motion does not drag the ether along with it. and thus each body on the earth's surface, in virtue of its motion with the earth, is traversed trav-ersed by a stream of ether. The question ques-tion thus arises: Does light travel through such a body with the same speed along the stream of ether as it does against it. or across it? The experiments ex-periments of Mieuelson and Morley in America lead to an affirmative answer for air. Lord Rayleigh.. in England, has obtained the same answer as to liquids and is now engaged on a research re-search in respect to the phenomena relating to solids. tiou of a compass needle placed near the wire. The experiment can be carried out with simple material In the following way: Take a glass filled with water, a Viroad tumbler or champagne glass filled half way with water, in which a handful of salt has been dissolved, n teaspoon, a fork with a metal |