PAGE ',0. THE MICHIGAN DAILY WED NESrAY, MURCTI 2?, 1940 Annual Spanish Play Will Open MondayNioht "Zaragueta," annual Spanish play 1 to be presented by La Sociedad His- panica Monday in the Lydia Mendel- ssohn Theatre, has been preceded by mnany other productions sponsored by the organization. One of the earliest presentations was another production of "Zara- gueta" in 1921. The following year the play given was "The Grasshopper Ants," a story based on an old fable. "Juan de las Vinas" and "Dona Clarinos" were presented in 1923 and 1924. In 1925 "Anything for Love" was produced, while "Fencing at Love" was given in 1927. The following year the club broke away from its tradition of single plays, and gave three one-act plays: "The Lover," "The Marquesa's Disappointment," and "The Miracle." "Rosina Is Fickle" and "Without Words" were presented in 1932. Last year's production was entitled "A Romantic Young Lady." Typeswriters Office and Portable Models New, and Reconditioned. Motion picture highlights of the famed San Francisco-Oakland Bay bridge will be the feature attraction of an open meeting of the A.S.C.E. at 7:30 p.m. today in the Natural Sci- ence Auditorium. Pictorial and technical aspects of the' bridge will be presented in the motion picture, to be shown by Prof. James H. Cissel of the civil engi- neering department. Professor Cissel has been termed an authority on the construction of large bridges, and is at present on a commission studying the possibility of building a span across the Straits of Mackinac. The inner mysteries of the honey- comb of heating tunnels beneath the Campus grounds will be explained by Edward C. Pardon, superintendent of Buildings and Grounds at the Sigma Xi meeting at 7:45 p.m. today in the Rackham Amphitheatre. Following light refreshments, the group will be taken on an inspection tour of the University Power House. Campus Leaders To Attend Dinner Eight campus leaders will attend the annual Campus Leaders Dinner, to be given by the University of Michi- gan Club of Detroit at 6:30 p.m. to- day in the University Club. Judge Guy A. Miller will be toast- master. Representing Detroit alumni and the Board of Regents will be Mayor Edward J. Jeffries, Jr., of De- troit and Harry Kipke respectively. Faculty and alumni guests from Ann Arbor will include Profs. Carl G. Brandt, Charles H. Peake and Karl Litzenberg, all of the English depart- ment, T. Hawley Tapping, general secretary of the Alumni Association, and Robert O. Morgan, assistant secretary of the Association. Country's Communications Disrupted By Magnetic Storm HAYDEN PLANETARIUM SKETCH OF SUNSPOT r MARCH 23,1940 BY WILLIAM H.BARTON, JR. EXECUTIVE CURATOR. e. GREAT SUNSPOT GROUP / tSEEN AUG.8, 1917 BY MT. WILSON OBSERVATORY. it" DISC REPRESENTS . ''.*COMPARATIVE SIZE fr9-1 OF EARTH . These Associated Press diagrams indicate how a magnetic storm, probably the worst in modern history, disrupted United States wire and wireless conununicationis. Center diagram shows how sunspots generated a shower of electrical particles which bombarded the earth and riddled man-made currents. Upper left, an approximation of the location, not in scale, of the sunspots as they appeared to Hayden Planetarium ob- servers. Lower right is a drawing of the 1917 sunspot g reup with the black disk representing the comparative size of the earth. DAILY OFFICIAL BULLETIN WEDNESDAY, MARCH 27, 1940 VOL. L. No. 129. Notices To All Faculty Members: 1. Life Annuities or life insurance either or both may be purchased by members of the faculties Trem the Teachers Insurance and Annuity As- sociation of America and premiums for either life Annuity or life Insur- ance, or both, may be deducted at the written request of the policy- holder from the monthly payroll of the University, and in such cases will be remitted directly by the Univer- sity, on the monthly basis. The secretary's office has on file blank applications for annuity policies, or life insurance policies, and rate books, for the convenience of members of the University staff desiring to make use of them. 2. The Regents at their meeting of January, 1919 agreed that any mem- ber of the Faculties entering the serv- ice of the University since Nov. 17, 1915, may purchase an Annuity from the above-named Association, toward the cost of which the Regents would make an equal contribution up to five per cent of his annual salary (Continued on Page 4) - - I - "\ : t =J': Bought, Sold Rented, Exchanged, Cleaned, Repaired- Our Convenient rental purchase plan will save you money. One of the largest and best stocks in the State. All makes and models at lowest prices. 0.DMr 314 S. State (Opp. Kresge's) Since 1908 Phone 6615 I 1 1I agnetic Field Is Influenced BY sun Spots By KARL KESSLER To sun spots, the elusive cyclonic storms which sporadically appear in the solar atmospheres, can be in- directly attributed one of the worst cases of communication disruptions in recent years which played havoc with radio, telephone and telegraph lines Sunday. Most noticeable effect of these solar disturbances, according to investiga- tions carried out'by Dr. Ross Gunn, '20, of the Naval Observatory in Washington, D.C., is their influence on the earth's magnetic field. Gunn received his M.S. from the University in 1921 and his Ph.D. from Yale Uni- versity in 1926. He served as an in- structor in the College of Engineer- ing at the University from 1920 to 1922. Simultaneous observations of sun spots and changes in the magnetic field have indicated that there is a high degree of correlation between the two. The influence of these sudden fluctuations in magnetic fields upon wireless communication is marked, as radio waves are electro-magnetic and are thus influenced by magnetic changes in the medium through which they travel. Less obvious is the relation of mag- netic disturbances to telegraph and telephone communication. The con- nection here lies through' what is known to communication engineers as "earth currents." Fluctuations in the strength of a magnetic field induce currents in electrical conductors within the shift- ing field. In the case of earth cur- rents, the conductor is the layer of moist earth near the surface of the ground. The difference in potential between points in these surface layers ordi- narily varies from zero to 50 volts. In the case of violent magnetic storms as those that occurred Sunday, these potential differences may be as high as 500 volts or more. Thus, since telegraph systems em-, ploy the earth as part of their circuit, these sudden and large changes in the magnitude of the earth currents not only make transmission difficult, but often cause cable insulations to burn out. These disturbances may be com- pletely local in character or may ex- tend over the whole country. The magnetic storm which passed Sunday appears to have covered an area ex- tending from Europe into the Middle West. Aluni Club Will Hear President Rutihven Talk President and Mrs. Ruthven will be guests of honor at the annual Spring Banquet of the University of Michi- (an Club of Grosse Pointe, to be held at 7 p.m. today in the Whittier Hotel. The group will hear addresses by Dr. Ruthven and Carl Bauer, Jr., pres- ident of the Ninth District (eastern Michigan) of the Alumni Association. Regent John Lynch, a member of the Grosse Pointe Club, will also attend. 'Case' Method Benefits Student In Business, Prof. Griffin Says Practice in the analysis of actualj business problems is the most import- ant benefit to the student of the School of Business Administration from emphasis on the use of the case method of instruction, Prof. Clare E. Griffin, dean of the school, said yes- terday. This method, he continued, has been used by business schools for ap- proximately 20 years, being preceded by several years in the field of law. Dean Langdell of the Harvard Law School was a pioneer in the develop- ment of the method, and Harvard was one of the first institutions to adopt it, Dean Griffin commented. A case, as presented to a student, consists of the statement of a defin- ite problem which has actually con- fronted some company, Dean Griffin explained. Included may be possible solutions or a statement of what steps were taken by the firm in question and what their results were, he said. The student is expected to study, analyze and work out these problems, he commented, and to reach his recommendations with specific points in favor of them. This analysis, ac- cording to Dean Griffin, composes one of the most important parts of the instruction, teaching how to study a problem to grasp its different angles and developing a procedure of anal- ysis for the individual' student. Another advantage of the case method, he pointed out, is that it presents material in an interesting way. At the same time, he said, it enables the students to make deci- sions without being discharged from a job for any mistakes made in them. The advantages of the case method, he said, make it potentially a more effective type of instruction than the lecture, text and discussion methods. .G.::;: 'A 'd.: isrn..< as - %". y: PROF. TELEQUIZ says: ei *1 Pens - Typewriters - Supplies "Writers Trade With Rider's" IDER'S 302 South State St. cA-7\You IMA~CINE? THE ELEMENT ISNY EVEN'DAMAGED.. AMD I1"-OUG4 1+ 4 KETLE WOULD BE RU/IAED! r's LUCKY 1 "4AS ITNE PO?-OUT PLUG +Af. SNtrs U o f -rRE ELEC- 1'RCITY AUrOAIA711cALLY IF YOU 1APPEN 0 FO RGET IT. W E I FOUND IT, THE KETLE HAD BOILED DRY! I ti Matinees aI Nig h/s 35c I1 QUESTION: What is a "person-to-person" long distance telephone call? ANSWER: A call on which the operator is asked to esablish connection with a named per- son or extension number at a given tele- phone. Use person-to-person service when you must talk to a particular-individual and no one else will do, or if you call an extension telephone on a private branch exchange switchboard. Person-to-person rates to points not shown below will be found on page 5 of the telephone directory or can be obtained from "Long Distance" (dial 0). RATES FOR THREE-MINUTE NIGHT AND SUNDAY PERSON-TO-PERSON CALLS ANN ARBOR to: 0 I DAILY 2-4----7-9 P.M. Today and Thursday rrA Fratic olv ';ra b raf an' 3 that tor t ;_r TECHNICOLOR FEATURETTE "OLD HICKORY" "DOG IN A MANSION" WORLD NEWS Albion A a ..... Battle Creek Bay City. Big Rapids Buffalo, N.Y. Chicago, Ill. Flint C ram " Iapids $ .55 Grayling .95 Houghton .60 Manistee .65 Milwaukee, Wis. .75 Nashville, Tenn. I .95 .90 .55 70 Petoskey Port Huron Saginaw Washington, D.C. .$ .90 1.40 .95 .90 1.40 .95 60 60 1.30 Om a call for which the char-e is 50c or more, a federal tax applies. ~~MICH IGAN BELL T ELEPHONE I - - 1 I I 1wil k mku. 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