New Britain Herald Newspaper, October 5, 1928, Page 6

DURALUNIN | IN AIRPLANE WORK Yibating Bars Give Pacts foe Salety ! Washington, Oct. § UM — Small, | precisely measured bars of duralum- | in, fleating free on films of ‘com- preased air and vibrating at the rate | of about 700,000 cycles an hour.| maintain a continuous loud hum in one of the laboratories of the bureau of standards. Driven pneumatically, each bar is| kept in vibration until it cracks, or has withstood two or three hundred million cycles of this rapid slight bending to and fro which subjects the metallic fibers of each side to alternate stresses of compression and tension. | The purpose is to ascertain just| how much stress this aluminum al? loy can be expected to withstand without “fatigue” failure when used in the construction of aircraft, where | lightness, dependability and strength are jmportant considerations. i The investigation is being ccn- | ducted with the co-operation of the | national advisory committee for| aeronautics under the personal| supervision of Dr. L. J. Briggs, as- | sistant director in charge of th bureau’s research and testing worl with special time saving appar: devised by himself and Dr. L. B. Tuckerman of the division of | mechanics and sound. Results thus far obtained indi- cate that, while a duralumin bar| subjected to steady pressure does not begin to yield until about 36,- 000 pounds have been applicd to the square inch, its “fatigue limit” is considerably less than half that amount. As far as known, Dr. Briggs explains, the strength of ali| metals is similarly decreascd when they are subjected to repeated load- ing and unloading. The value of measuring the | “fatigue limits" of metals beyond | which ‘they cannot be expucted to stand up indefinitely, he points out, is emphasized by their use in | high speed machinery and mechan- fcal devices in which they are sub- /| jected to repeated loading. condi- | tions either directly or through vi- | bration. | In the case of steels, which have | been investigated widely, it hns} been found that the maximum | stress they can be expected to| withstand indefinitely under such | The conditions may be ascertained by #subjecting specimens to about 10,- 000,000 cycles of vibration wnder o difterent loads. With the lighter alloys, however, it has been dis- covered that tests comprising two or three hundred million cycles arc | Necessary to ebtain reliable meas- urements. ‘This raised the problem of de- vising means of loading and un-| loading the test bars more rapidly than was possible under the old system. Dr. Tuckerman saw th possibility of employing a disc ery made about 30 years ago | Lord Rayleigh, noted English physicist, who learned during ex- | periments with sound that, know- ing the dimensions of a free bar- | and ghe extent of its movement from rest position at the center’ when {n vibration, it was impossible | to compute the fiber stresses. | With experience he had gained | in the aerodynamics laboratory, Dr, | Briggs worked out a method where-| by the bars could be kept frec| during the tests by supporting| them on films of compressed air at | the points where they remain sta-| tionary during vibration and de- | veloping a pneumatic drive utiliz- | ing jets of compressed air direct- ed against them on both sides at each end. The device has been able to de- | welop 200 vibration cycles a sce- ond, compared with 30 under th old method, and to produce fi wtresses in the free bars ranging| up to 23,000 pounds to the square inch, 'Austria Sees the End | Of Dumb Movie Actors | Vienna, Oct. § UP—Recent movie- tone tests convinced leaders of Aus- ‘ tria’s film industry that the new process would displace the silent screen dramas. Austria has produced few mov- ing pictures and these were almost exclusively for local consumption. With the development of talking pictures it is Toressen that each nation will be required to furnish its own actors and actresses. The belief exists hers, therefore, that new and talented stars will take the places of those mow fa- mous in the moving picture world. Familiarity with the language and superb diction will b¢ more im- portant than beauty. AIRSHIP RESEMBLES TOWERING CATHEDRAL Ship Will Have Speed of 70 Miles an Hour at & Weoght of 5,000 Foet London, Oct. 5 (M—The image of a vast cathedral with workmen like pysmies high aloft is the impression obtaincd from an inspection of the R-101, England's greatest airship, row under construction in Varding- ton, Bedfordshire. The R-101 is a sister ship of the R-100 being built at Howden, York- shire, and is designed for service between England and Canada. bout half finished and slowly so that the de- n correct faults ms they le disappointment has been ma ted in Great Britain over the announcement that the R-100 would not be able to make a transatlantic test flight this year. The final routes to be assigned to ch airship are still in some doubt. ne will probably link England with India. The builders of the R-101 have guaranteed a speed of 70 miles an hour at a height of 5,000 feet and a cruising radius of 4,000 miles without refucling. It is 724 feet lon ike the R-100, has pas- accommodations on two . There will be sleeping cab- ins and dining room facilities for 50 persons. Other innovations include & smoking room, quarters for the crew and a Kitchen equipped with | electrical stoves. Liberians Celebrate Gay Annual Flag Day — Monrovia, Liberia, Oct. 5. Approximately 1,000 children, repre- senting various' Sunday scheols of the city, paraded here in commemor- ation of Liberia’s annual flag day. Others in the procession included 500 boy scouts. Under the direction of Captain Charles King, a mixcd cholr of 40 voices sang during a mass meeting. as displayed It is very similar to the s emblem, with eleven 4 and white stripes. In blue square repre- senting the dar continent and & single white star, symbolizing the only Negro republic in Africa. Nearly every military term is Freneh, grenade is Spanish, mar- coni is Ttalian, caste is Portuguese, chintz is Hindu and lilac is Persian. | Stomach Disorders First Revealed by Coated Tongue Your tongue is nothing more %han the upper end of your stom- ach and intestines. It is the first thing your doctor looks at. It tells at a glance the condition of your digestive system—and physicians say that 90% of all sickness starts with stomach and bowel trouble, A coated tongue is a danger sig- nal of those digestive disorders which lead to so many kinds of serious illness. It tells why the Jeast exertion tires you out; why you have pains in the bowels, gas, | sour stomach, dizzy spells. Coating on the tongue is a sign | that you need Tanlac—the medi- cine which has helped thousands who were physical wrecks from stomach and bowel troubles—who had “tried everything” in vain and about given up hope. Tanlac contains no mineral | drugs; it is made of barks, herbs and roots. Get a bottle from your druggist today. Your money if it doesn’t help you. Tanlac 52 MILLION BOTTLES USED Prepate Now for the Long Evenings Ahead - Fill the empty sockets and replace dim and burn- ed-out bulbs with fresh Mazda Lamps. Order a Handy Lamp Kit from any of our employes. This T closing time tomorrow night, down goes the curtain on the most popular floor-covering sale held in years. Gone will be your opportunity to buy genuine Congoleum ‘Gold Seal Rugs at these bargain prices. For after this week, prices positively will go up to their former levels. However, it is not yet too late. Fresh shipments of many popular new patterns have arrived for the benefit of “last minute shoppers” so you are sure to find exactly the patterns and sizes you want. There are dainty, happy-colored florals First Quality, Guaranteed Goods— All of the Congoleum Gold Seal Rugs offered in this sale are fresh, new goods. All of them carry the Gold Seal pledge of “Satisfaction Guaranteed or Your Money Back,” pasted on the face of the goods. All are made by the exclusive Multicote Process which builds rugged durability right through the pattern. No other felt-base floor- covering offers so much beauty and value as genuine “Congoleum.” Easy To Lay, Too—Congoleum Gold Seal Rugs are the simplest things in the world to lay. Just put them down —and they staydown—withoutany fastening whatever. Never curl up at the edges. Mackay & Wallin " age. 68 088 9% oL RUGS for the bedroom...Orientals in rich luxuri-' ous hues for living and dining room... quaint tile and wood-block designs for kitchen, pantry and bath. Each and every one expressing the latest trends in modern rug design. Real Money-Saving Prices 6x9 ft. size.. ONLY $5.20 7'%x9 ft. size ONLY $6.45 9x9 ft. size .. ONLY $7.70 9x10%4 it.size ONLY $8.95 9x12 ft. size¢ ONLY $9.95 Other sizes down to 1%x3ft Rugsat........ 39¢ Genuine Congoleum Gold Seal Floor-Covering The same durable, flat-lying material in roll form for use over the entire floor. Needs no fastening. Satisfaction guar- anteed by the Gold Seal pasted right on the face of the pattern. L 2 Yards Wide. ........... 5OC per sq. yd. 3 Yards Wide. ........... 67 C persq yd. B. C. Porter Sons And with this beauty comes freedom from the drudgery of heavy sweeping and beating. Hours saved for the things you enjoy doing. For a damp mop whisked over the smooth, sanitary surface makes your Congoleum Gold Seal Rugs smile with spotless cleanliness. ‘ ' i Don’t Delay~1f you put it off until the last moghent something may pre- vent your géing. Then you will have to pay more for your Congoleum Gold Seal Rugs. So don’t let this opportu- nity slip by to bring the remarkable beauty and practical advantages of Congoleum Gold Seal Rugs into your home at these money - saving prices. Don’t Miss This Opportunity! Don't forget that these bargain prices are effective this week orly. Regular prices will be restored when the Sale ends tomorrow night, October 6th. All of the stores listed below are prepared to give you prompt, courteous service. K [0 NS 'Bristol Bristol Furniture Co. JohnA. Andrews & Co.le. ¢ Funk & Sons, Inc. kit contains SIX assorted lamps for the home— two 40-watt, three 60-watt, and one 100-watt. Price per Kit $ l 41 (Delivered) Conn. Light & Power Co. 82 W. MAIN STREET HomeFurnishingCo. J. M. Curtin & Co. TEL. 3600