Evening Star Newspaper, May 2, 1926, Page 42

SAMUEL G. BARTON Penneylvania. BY PRO Of the University of The sun is a star cause of its nearness it appears to us r brighter than any other star After the sun, the next brightest star we see then is Sirius, which gives us only one-two-hundred-billionth as muc Jight as the sun. The next fainter star seen in the United States is Vega, at A, figure 1. To us Sirius is fipes as bright as Vega. The next tinter star is Capella, at B, figure 1 vhich is but iittle fainter than Vega Now, the brizhtne of the sta as v see them depends mot only upon he amount of light which they emit, the day Be. <o upon the distance of the star. w a given star the apparent bright ess varies inversely as its distance from us; that is, if we place the same iar twice as far from us it will give <only a fourth as much light, and if (ken three times as far away it will ~ive us only one-ninth as much light By this principle it is easy to tell how lieh light we would receive from any r oat_any distance as soon as we the distance of the star. We to compare the light We usually a star We now v then itted by different stars. ympare the light emitted by with that emitted by the sun. call it the luminosity of the star. In the cases of the stars mentioned ahove, for example, we find the lumi osity of Sirius to be 28.6; that is, at same distance Sirius would give S times as much light as the sun P AT t inte gives out 31 mes h light as the sun, and Capella gives out 130 times as much eht he sun It is obvious, then 1t apparent brightness of the « safe guide as to tht real mminosity of the stars as in many cases of ppear re deceit he Tuminosities are just in the erse order from that of the appar- brightness, for the very brilliant ' s the least luminous of the four. Now, of it would be the is not itness course Figur The planets in May. to know the luminositi so ihat we might see » limits of luminosity and of stars have each tv, and how the sun ranks her stars in this respect. Thes \uestions have heen discussed anew ery Iy by Prof. van Rhijn of Giror . Hollay The apparent br ndicated by its - of the first magnitude interesti star 2.51 f the second magnitude, and a the second magnitude gives us 1es as much light as one of the nitude, so on. For com- minosil we compute the » that each star would have it ve away. A light year x trillion miles. This mag- lled the absolute magni r. Van Rhijn v : the stars between »s minus 4 and plu: absolute magnitude minus 4 2,631 times as much light here few scattercd brighter than this, 1 Deneb, at C. figure nagnitu tar of t 4365 times as 1% @ star of absolute mag itude plus 14 ch st therefore, ave faint. and not enough such can be to enable the inves- tigation to proceed heyond this point The least luminous star known is the rompanion to the star Proc which emits only six-one-hundred-thousandths much light as the sun. There are probably many stars of le itv, and no doubt some, if not many, bich are entirely dark except as the veflect the light of other bodies, but we « no definite statement as to thei Van Rhijn con v make utes the number of tnde betwetn » be found in on cubic parsecs: L space of about 35,000,000 t years near the sun. There is but one Star of absolute 1 hout three times this vol gnitude minus 3 there are the volume, of mag- 5 in the volume men number increases very until we reach the magnitude which is nearly the absolute itude of the sun, which provides rs. There arve 6,537 stars of itude or brighter in the vol number of star: but mu ude plus mig The than this incie lowl Petween mi 14 there are 86,100 star in the s of solute although the unfavorably with it neverthe erage in luminosity. decrease in the number - luminosity, as was for- merly supposed. Of the stars there is one star « space equal to AAAAAAAAAAANY WALLBOARD (New) res very stars, is. < not within these limits, f some magnitude to the volume of a Fireprocf Rockboard $35 per 1,009 feet Main Office. T Camp Meigs. :\b- &CSts. [l SW-&Fa. Ave. outhwest o Northeast. very | s luminos- | ude | . a total | volume. | Figure 1. so that the dire the bottom as south now is. 'he constellations at 9 p.n on faced is at the botto he center of the map is the point overhead.| THE SUNDAY May 1. : that Hold the map to the sky, , if facing east hold east at sphere of radius 4.8 light yvears, which is equivalent to 285 trillion miles The Planets. At the first of the month there is no levening star except Neptune. which s not visible to the naked eye. Its position in Leo is marked on figure 1 On' May 1. however, Saturn hecomes an evening star. Before that time it rises after the sun has set. On May 1 it Wt 746 pam. After May 14 it rises before the sun has set. On May 31 it will rise at any of the stars we ever see excepl ' Sirius. It is in the constellation Libra in the position marked on figure 1 Jupiter rises at > a.m. May 1 and at 12:10 aan. May 31: on May 3 three of the satellites of this planet will he out of sight, because either in front of or behind the planet from the time it rises until 4:38 a.m. Eastern stand ird time. It is in the constellation | Capricornus. Mars rises {at 1:12 am. ) at 2:16 a.m. May 1 and v 31. It is in Aqua- rius and Pi during the month. Venus rises at 3:16 a.m. May 1 and t 2:41 May 31. Vtnus, Jupiter and Mars will be conspicuous objects in the eastern sky in the early morning Mars Venus and Jupiter. It lies between them. The relative positions of the planets on May 1 is shown in figure 8. There are no bright stars in their vicinity. Venus is the brightest ob. ject in the sky except the sun and moon, so it cannot be mistaken. Ura- nus is not visible to the naked eye. If one looks at Venus on the morning of May Uranus may be seen close times as much light as | is brighi, but not the equal of f beside it. May 4 (The writer will discuss topics sug. zested by readers or answer questions in this column if the matter seems to be of general interest, as opportunity presents itself.) BLACK OPALS COSTLY. { Price Up to $100,000 Due to Scar- city at Source. LONDON, May | (®).—The owners of black opals are extremely lucky people at present, contrary to the ac- cepted superstition, for the value of these gems is riging as they become more and more scarce. The mines in Australia which produce them are ziving out und no new sources have Deen discovered. Some of the stones shown in Bond street are priced at £20,000 (about $100,000). The largest of the stones the “Princess Mary” which is th heaviest of these gems in exlstence, is on display I v.h Vears the Natien’s Faverite) - S hl'rr—:fllbfllnm At Barbers and Druggists Women Are Careful Drivers! Statistics prove that the woman driver has less accidents charged to her than is generally sup- posed. Women are quick to adopt—and influence | the purchase of safety devices. | | And our plate-glass word. awa) your car. W A Good FVisor Helps All Drivers visors, amber and green are “good’” in every sense of the They will keep sun and headlight glare v from your eyes—and add to the beauty of Come in and inspect them. now on sale, in E. J. Murphy Co., Inc. 710 12th St. N. W. Established | 31 Years i Finest Quality Shur-on Frames | Finest Quality Toric Spherical KAHN on 7th St. Main 5280 Established 81 Years Specials Monday and Tuesday Complete Outfit, Case and Cleaner Included Sold regularly, $15 to $22. PRICE, Monday and Tuesday....... Genuine Toric KRYPTOK Invisible Bifocal Lenses First and best quality, Toric KRYP- TOK Spherical Bifocal Lenses—(one pair to see near and far). Best lenses made. SPECIAL 3750 EYES EXAMINED FREE BY OUR REGISTERED OPTOMETRIST The Most Modern and Finest Instruments Made ace used in our Optical Department for examination of the ejes. KAHN OPTICAL CO. 617 Seventh Street N.W. (Between F and G Streets) STAR, WASHINGTON, D. C, MAY 2, Parent-Teacher Activities All notices for this column must be received by noon on the Wednesday preceding the Sunday on which pub lication is desired. Address Mrs. J. Saunders, 3618 Porter street. Parent-Teacher night at the Na- tional Theater will he May 11, when the comedy “Thank U™ will be given by the stock company. The ways and means chatrman of the District of Cd- lumbfa Congress, Mrs. Louls Castell, has distributed the tickets among the school clubs so that every section of the District will be present. Many assoclations are buying a box for the officers and principal of the school, and the other members will sit in a body in another part of the theater. The delegates from the District to the national convention in Atlanta left last night on a special cal M Giles_Scott Rafter, Mrs. G. W. Lady and Mrs. Louis Castell were three of the delegates. The John ton Mothers’ Club will meet at 0 o'clock tomorrow afternoon in the Cleveland Park Con- gregational Church, Thirty-fourth and Lowell pets, Mrs, Alburtis will talk on “Summer Camps” and Dr. Willard _Camalier will speak on “Dental Health.” The Jackson Parent-Teacher Asso- clation met Monday afternoon, and Miss Wilkins gave a talk on “Pre- school Work." The association voted to send a setter to the B cation recommending that the princi- pal of the Jackson, Miss Ossire, be advanced from teaching principal to administrative principal The name of the Brightwood Park School has been officially changed to Truesdell. The Truesdel Parent Teacher Association met Monday afternoon with the president, Mullenberg, in the chair. The - man of the moving picture committee. Mrs. Shankle, reported that § been cleared by the | Association benefit in the ter. Fifteen dollars was sent to the budget fund of the District Congress 1t was voted to have a school lunch- eon June 3. will be held at the next meetin which will' take place on the evening of May 17, The Emery - Eckington Parent I Want Every Ma Dress chain, including Washington. ard of Edu- | The election of officers | Teacher Association met in the Eck- ington School April 16. A talk was given by Mrs. G. W. Lady about the activities of the District of Columbia. ngress of Parent-Teacher Associa- ions. Another talk was given by Dr. Hoofnagle on “Dental Hygiene.” I L. Higgens demonstrated a maChine for visual education. A meeting of the Langley Junior High Parent-Teacher Association was held April 20. The program consist- ed of several songs by the Boys' Glee Club of Langley, a cornet solo by Roy Wiseman, 9A-1, and a viotin solo by 3. A letter w ashington Railway and Electric Co. saying the request for a car stop on the far side of T street and the near side of S street had been granted. Mrs. Jorolemon, airman of the finance committee, reported that a card party would be held May 5 at the Langley School. The president appointed the following as members of a nominating commit- tee to report at the May meetin Mrs. Carpenter, chairman: Mrs. Ji rolemon, Dr. Day, Mrs, Kinnear, Mr. Tepper, Mrs. Wiseman and Mr. Profe. Mr. Draper, principal, told of the ath- letic meet to be held May 22 at the Eastern High School Stadium. He explained that athletic events would be given in the morning and that a | winning | hool | competitive drill of the platoons from each junior high would be given in the stadium at o'clock. Mr. Henderson requested the privilege of donating a cup to the | platoon of Langley winning the rig to compete in this drill of Ma Senator Cameron of Arizona told of his interest in educational conditions in Washington and his belief that Washington schools should be the best of the Nation. At the roll call Miss Tennyson's section, TA-1, won the pennant chool campaign day was held in the auditorium of the Henry D. Cooke School April 23 under the aus- pices of thé Home and School Asso- ciation, with Mrs. W H. Ross presid- ing. Miss Catherine Wi of kindergartens for the District fo Columbia, and Mrs. G. W. Lady, chair- man pre-school work, gave talks on the subject of pr ichool education 15 it now operates in Washington and throughout the country. A program consisting of music and recitations b A pre In St ot vt kins, director | On Any uréhii 1926—PART 1. pupils of the first and second grades, also music by Miss McFarlane's kindergarten band, preceded the speakers, and regular business con- cluded the entertainment. The Hubbard-Raymond Home and School Assoclation met April 19, Charles E. Kern, the president, pre sided. Two pictures donated by Miss Hendley and purchased by her in Bel gium last Summer are to be framed and hung in the corridor of the Ray- mond ScHool. A third is to be framed Hubbard School. May 5, and the other at the Hubbard, May 19. The proceeds are to be used for school and playground equipment. The annual meeting of the Morgan School Parent-Teacher Assoclation was held April 20, at the school, at 8 p.m. | The following offiers were elected Mrs. Harvey W. W.ley, president; Mrs. George Cornwell, 'vice president: Miss M. E. Moore, secret Mrs. M Kochenderfer, treasurer; Mrs. L. W Tilton and Mrs. V. Kelsey, delegates to the District of Columbla Parent- Teacher Assoclation; Miss S. K. Kent, | chairman of_entertainment; Mrs. W, | R. Smith, chairman of refreshment | Mrs. ¢. W. Williams, chairman of the | press, and Mrs. Arthur J. Davis, mem- | bership chairman. Dr. Edwin €. | Barnes gave a talk_on “The Modern Trend of Music Education.” Miss | Gladys Price and Mrs. Lillian Brous- | | seau sang several duets, accompanied I'by Miss Athey. The lantern just pur ! chased by the association, us a result | of four school luncheons, was demon- strated. Refreshments were served. he Bryan Parent-Teacher Asso- WHEN YOU NEED A KEY/| | You need our insant duplicating service Duplicate Key, 25c Bring your locks to %the shop TURNER & CLARK Basement 1333 New York Ave. BumsteadsWormSyrup “To children an angel of mercy.” When di rections are followed IT NEVER FAL Despite searcity and enormous cost of SAX TONIN. it contains full dose. Stood sixty years' test. Sold everswhere, or by mail Up to $20 I've got the dress-up fever, and it's extending to every store in my I want everybody to be dressed in the New Spring Styles, regardless of whether or not they have the cash. Tomorrow, all you need is a dollar bill, a smile, and your promise to pay a lit- tle each pay day. Come here where credit is extended freely, without any I've gone through my stocks and cut prices on some of the latest numbers. I'm going to make it extra easy red tape. people. PR I trust all the working ICES SMASHED for everyone to buy now. Beautiful georgettes, etc., in all sizes. Come dress up on easy credit. Women’s and Misses’ COATS 519 Clever styles in Sport and Dress Coats. Smart new new colors. Priced as Jow as....... flat crepes, printed silks, As low and hung_in the third grade of the | Plans were made to | hold two lunches, one at the Raymond, ciation met April 22, at which time a report of the public meeting of the Board of Education was given. The Kenilworth Parent-Teacher As. sociation held its monthly meeting in the school April 21 at 2 p.m. The president, Mrs. G. A. Lingebach, pre- sided. Mrs. Lingebach gave a talk on the need of a playground. A luncheon will be given M 5 scap and towels for the school. iss Vaughan's room won the bowl FOR SALE 1033 Newton to bu !lv( gold fish for having the most mothers present. The Powell-Johnson and Bancroft | Parent-Teacher Assoclation will meet in the Mount Pleasant Branch Public Library Tuesday at 2:30 o'clock. Afte: a brief business meeting, at which the question of separating into three organizetions will be discussed, there will be a social, with refreshments BY OWNER St., Brookland $16,500.00 16 rooms, 2 baths, newl new h.-w.h. system, electric | ft; screened porches; I Make a Specialty of Outfitting Stout ‘Women All my outsize garments are made under my personal Those new popular blue suit ble breasted. 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