Evening Star Newspaper, December 14, 1926, Page 26

26 THE EVENING STAR, WASHINGTON, U. C. TUESDAY, DECEMBER 14. 1926 : . T0 MEASURE TIME % Bureau Perfects Apparatus _of Minute Accuracy, Set- ting Record. (S " 'LOUNGING ROBES OF RAYON The most comfortable thing you can give a man—Wednesda several hundred featuredal avery moderate price, quality considered Some extremely important in some S . A Not only the last word in comfort but a leading light in style. The Tl e 3. ‘ : .- shawl collar and deep cuffs in the famous-for-wear Skinner silk. And the yardstick of the universe, would i 2 ' . ~ . . e ety 3 Pl - ’ the robe in figured, flowered, checked or ombre shaded rayon with silk prosen such aceuray. Some very N : waist cords. You can’t help finding just the one to suit the small, the finely adjusted timepieces, it was e: 3 plained at the bureat might run over LB e . e : medium, the large, or the extra large man you want to please Christmas. %o@ © G o JN Apparatus for measurement of time | 0 an accuracy of one or.two hundred thousandths of a second pas been con- structed at the Bureau Jf Standards. This is believed to be ten times fine a measurement as has been tained by any previous method. One hundred thousandth of a second com very close indeed to the vanishi point of time, so far as human recog pition is concerned. But it may be- XXX e 0} the course of a day without losing or ‘nhlnlng as much a second, but ; when it came to measuring the sec- -~ X R . . . gnds themselves they would be founa : \ i Other Imported and Domestic Silk Lounging Robes and to vary considerabl: They might av- P erage u])fr.’llllolr a ru(ek_v ;\'Ithin LhP % > > % (First Floor, The Hecht Co.) course of an hour or 2 ours, but i . . ~ r~ th vould X little i} ientific 2 % Q. . o . s Mtmes” o, et nsite. ot the | B | o : ' ] Dressing Gowns, $15 to $100 second itself in his researches. = ' = e & Thme Movements Used. | 4 5 : ; T 'lk L R o o e = o st , Rayon House Robes Silk-Lined Robes has five essential parts—a tuning 5 L 4 ¢ £ fork, @ pendulum swinging in a | A : : 1 vacuum, a photo-electric cell, an os. | 2§ § o &2 : SZO 525 cilograph or tiny mirror mounted on PR b & 3 4 ¢ two wires in a strong magnetic field % \ ¢ and a high-speed camera. 5 | < % " L L g 2 | i g f ’ d % g e S el 3 o The gift discriminating! For the No need to be’a sybarite to exult in swinging inside o case from which ) clubman or man-about-town critical the luxury of this silk-lined rayon house P on d coeatad. e it | 1 . { ; ' and keen on correct tailoring even in a robe. Tailored to the last detail per- s a icely 3 3 zt 4 p .o . 2 . % p? friction is at a minimum. Since the | 3§ } ¢ ; lounging robe. Beautiful colorings. fectly, it will make a perfect Xmas pres- friction of the alr has been removed i b 2 7 with the vacuum pump there is very I ¢ £ i All sizes. ent. little to stop this pendulum swinging | 5@ | c 3 btheecd : (First Floor, The Hecht Co.) (First Floor, The Hecht Co.) indefinitely once it has been started. = 3 ® As a matter of fact, it will swing for five hours, each complete swing tak- |? P oum 10 y L 7 Men’s Smoking Jacket | Men’s Blanket Robes swing passes a definite point a flash = of light is let through a window in the | 2@ | 4 k % case. This light flash falls upon a |3 < ‘ 50 photo-electric cell placed just behind |,§ > 3 o ' . this window. In this ceil the Hght|%5@ \y & L i £ 3 generates a tiny current of electriclty | % mote hars two.or hree minionthe of ' | | 4 . : 1 Smartly “tai- After all, many men like the blanket an ampere, One of these currents is | fugf | e ; ) 5 lored in a two- style lounging robe the best of all. It's generated every half second. 5 o 3 o . The current passes through a three-| - Q' e Pa i~ %A faced fabric. Dark such a comfortable garment. Colorings stage vacuum tube amplifer where | G p . ced i t is magnified about 10,000 times, an, 2 R i s with Tiaas o 2 rom there passes to the oscllograph, [ §34 3 ; S . ")ul"dt];‘“rlg; s to please the- most conservative or bizarre where it causes the mirror to vibrate 3 i : = e ik s nt the same Intervals as the swing of | > § | ; o : R T taste. Piped with silk cord and a silk the pendulum. 2 Bt .I'll( C Sy d % ot . t el 11 d i Attached to the apparatus is a tun- [ 333 | e 3 " 4 N size range from 36 « cord at waist. Sizes small, medium an ing fork vibrating at the rate of a I %2 - 4 & » £=) l' thousand vibrations a second. A . o % to 46. o arge. " Vibrations Recorded. A 4 {First Floor, The Hecht Co.) b ‘hl\’nw the camera is 150, Placed that | p . : . . 3 P e film is exposed to both the mirror 7 : vibrations and the tuning fork vibra- | B ’ : " \ M I th H Sl p 1 tion, This fim s 40 reet Jong, and | °€ | - o : " en s L.eatner riouse il ers, the camera is electrically operated. 5 & 2o : : B e w e iaat fine > g B e } 1 Another adjunct to solid comfort that never comes B e : ’ ( o amiss as a Christmas gift. Select black leather or tan. Mibeating fer mE:o“-ml"m nese | €8 |f > b 4 A b . 7 The lasts are comfortable and the size range complete. vibrations cause heavier lines P 4 % A 5 e g o S P pear at intervals. A = s } ) 2 Men's Hylo Felt Slippers, $2.50. Thus the number of thin lines be- » > tween two heavy lines represents the number of times the tuning fork has vibrated in half a second. Each of the thin lines represents a thousandth of a second and measurements of the space between them can easily be made which will carry the time divi- sion into hundred thousandths of a second. X > The tuning fork and the pendulum | g act as checks on each other. The ac- curacy of each could be tested, de- pending upon which was agreed upon as the standard. Thus if it Swas agreed that the pendulum was com- pleting its swing in exactly half a . gecond and the tuning fork was shown by the film to be vibrating only 450 times in this period, the fork could be set down as inaccurate. On the other hand it might be assumed that the fork was vibrating ekactly 1,000 times in a second and the pendu- lum would be at fault. Use Special Forks. Tuning forks can be made with wvarying vibratory rates and extremely accurate time measurements could be made with an instrument vibrating only 100 times a second instead of a thousand. The behavior of a tuning fork still is rather obscure, according to P. P. Quale, of the sound labora- tory, who has been in charge of con- structing the apparatus and much re- mains for scientists to find out. For instance, the vibrations will vary considerably with temperature changes—just why is uncertain. Among the scientific researches (First Floor, The Hecht Co.) (Second Floor, The Hecht Co.) 7 O A A AT & A UGG RS which may be greatly aided by the extremely accurate time measure- ments made possible by this method are the gravity measurcments of the Coast and Geodetic Survey. But the great value at present will be in de- termining the vibratory rate of vari- ous tuning forks. . Formerly this has been done with PR o 0. 7o o o, SUNZ o o, o Cl “ o o N XS only to strike an average over a con- ? | LJ LJ ITALY TO BUILD SHIPS. S llk : Shlrts pedo boat destroyers propelled by tur- wa: lan buflders after an S‘ I'i ~ [ o - o e —aww D OULA COLOYS OF Stripes 5 . 3 1 7 ; - ters - Perfectly tailored Naples, while the turbines will be N with separate collar to match Clgdrette ngh erteciy Northern Ireland will continue its | S X ; i A gift to win a man’s sincere Large assortment for gifts to women. A chap doesn’t have to be super i 4 £ th dern. T . with the smack of the modern. I hey’ll ]JC ]ust as wel- with the various sleeve let s. i & a3 atd % B iowiio i s hare engths. In S ot e T averys oA s space when traveling, another W. A. Stove.. 1550 Fairmon: Lump 10.00 % or doesw’t please— ; Holiday Bouxes for 923 New York Ave. N.W. p TN extremely accurate chronometers, but it has been possible by this method { 3 & siderable périod—not to get inside ©of the second itself. Rumanian Destroyers to Be Con-|aQ¢ | | structed at Naples. ) | ROME, December 14 (#).—Two tor- i \ B $8'95 k i bines are to be bulit in Italy for the ; X 5 Rumanian government. The contract K Dunhill, Ltd. - Splendid grade of silk national competition. . The ships will be laid down at made in Triest. - Plaincolors housing subsidy two years longer. 5 s i Fancy leather-covered lighters, in pink, green, V ot # . pooie Tl e e SIELS| regard. Silk shirts are fashion- red and brown, in attractive boxes. A giit fastidious to appreciate silk pa- ) | able, also extremely comfortable. Others at $10 to 850, = JedS s o ot ball Slas g : iy / Besides they outwear their cotton o g g i : cousins. In a complete size range Rt o voull T - e : oYL sins. a p s ang $10 wearimg well they take up little for cash delivery only Ef | holiday boxes ready to send. and likes to own. 1f you are in doubt give adv S 3 i . . y advantage. W. A. Egg...$15.00 = = (First Floor, The Hecht Co.) thisclor Choshnns | (nkairios i wasut ol (Flrst Floor, "Tue Heent co.) W. A, Nut.... 1525 = If it doesi't fit : ; e All gifts put in exchange it after ’ o gl s sending if you so B J ERNER Christas. A L s desire. Main 8944 1937 5th St. N.E. T DT NI DT N ( o o G « 3‘ %A T