5428 schools throughout the country and numerous WHY schools in China, Japan, India, Palestine, Egypt, Chile, Cuba, Porto Rico, Alaska, Hawaii and the MILLIKAN AND GALE'S PRACTICAL PHYSICS It is well-organized, simple, teachable. It emphasizes basic principles. It makes practical applications. It has unusually fine illustrative material. SARGENT'S HANDBOOKS AMERICAN PRIVATE SCHOOLS 8th Edition, 1922-1923, 896 pages; round corners, crimson silk cloth, gold stamped, $4.00 A Guide Book for Parents A Compendium for Educators Annual Review of Educational Literature and Events. NEW ENGLAND 3d Edition, carefully revised throughout, 8 vo., 928 pages, 4 maps in 5 colors, 25 other maps and plans, 52 illustrations. Full leather, $5.00. Silk cloth, $4.00. All the Principal Motor Routes are clearly shown. Every town and city in New England of importance is described. The history and present-day activities are given in detail. It is the Only Book That Treats New England as a Whole. PORTER SARGENT 14 BEACON STREET BOSTON Please mention School Science and Mathematics when answering Advertisements. Note concerning the preceding article on geometrical analysis. If any teacher wishes reprints of this article for use in their classes, such reprints may be obtained from the publishers at the rate of $1.50 per 100, or 80 cents for 50, postpaid. See also problem 760 in the Problem Depart ment. THE NEW CHAIRMAN OF THE DEPARTMENT OF GEOLOGY AT THE UNIVERSITY OF CHICAGO Dr. Edson Sunderland Bastin, Professor of Economic Geology in the University of Chicago, has been made Chairman of the Department to succeed the late head, Dean Rollin D. Salisbury, according to a recent announcement of the Board of Trustees. Professor Bastin, who for fifteen years was geologist in the United States Geological Survey and was recently chief of the Division of Mineral Resources, received both his Master's and Doctor's degrees at the University of Chicago. He has done special work for the government in Maine and the western mining districts, made an examination of copper properties in Chile, and is the author of numerous scientific reports published by the United States Geological Survey. It is a matter of special interest that Professor Bastin's father was a professor in the Old University of Chicago. NEW DEAN OF THE OGDEN GRADUATE SCHOOL OF SCIENCE UNIVERSITY OF CHICAGO Announcement is just made by the University of Chicago Board of Trustees of the appointment of Professor Henry Gordon Gale, of the Department of Physics, to be Dean of the Ogden Graduate School of Science, to succeed the late Dean Rollin D. Salisbury, who occupied the position for over twenty years. Professor Gale, who has been Dean in the College of Science for ten years, received both his Bachelor's and Doctor's degrees from the University and has been connected with the Department of Physics since 1899. He has been physicist and research associate of the Carnegie Institution of Washington at Mount Wilson, California, joint editor of the Astrophysical Journal for ten years, member of the International Commission on Annual Tables of Constants, and chairman of the Division of Physical Sciences, National Research Council. During the war Dean Gale was major and lieutenant colonel in the Signal Corps and was an officer in charge of a special service division at Tours, France. He was cited by the commander-in-chief of the American Expeditionary Forces for "especially meritorious and conspicuous service," and has recently received the decoration of the Chevalier of the Legion of Honor. SCIENCE QUESTIONS. Conducted by Franklin T. Jones. The White Motor Company, Cleveland, Ohio. Readers are invited to propose questions for solution—scientific or pedagogical-and to answer questions proposed by others or by themselves. Kindly address all communications to Franklin T. Jones, 10109 Wilbur Ave.. S. E. Cleveland, Ohio. The EDITOR will receive examination papers with many thanks. School examinations of all sorts are desired. Please send them in-likewise any newspaper clippings similar to the question proposed in this issue. PROBLEMS AND QUESTIONS FOR SOLUTION. 399. A motor truck hauls a 43-ton boiler six city blocks. A 5-ton truck carries a capacity load over an ordinary country road. Which machine is performing the greater "stunt"? (a) Adopt reasonable figures for road and load resistances and compare numerically. (b) What apparatus would an engineer require to make an experimental comparison? 400. EXAMINATION PAPERS. The following paper was submitted by Mr. John Lundberg, Goteborg, Sweden. Translation by Mr. Olle Schjolin, (Graduate Orebro Tekn. Elem. Skola, Orebro, Sweden. Designer, The White Motor Co. Sweden STUDENT-EXAMEN PROBLEMS IN PHYSICS April, 1922. 1. In a mercury manometer with one leg closed and the chamber filled with dry air when the pressure is 760 mm. at a certain temperature, the mercury level in both legs stands at the same height. The volume of the enclosed air is then 50 cc. The manometer tube which stands vertically has an area of 1 sq. cm. Now, if the open leg is filled with water to a height of 48 cm. and also the pressure over this leg is changed, what must be the pressure to make the level of mercury in the closed leg 10 cm. higher than in the open leg? (The temperature remains constant. Sp. gr. mercury 13.6) 2. A straight solid stick of any area is placed on end on a horizontal floor leaning against a wall in a vertical plane at right angles to the wall. The stick is in equilibrium at a very small angle because of friction; TO GIVE ENDURING SATISFACTION MANY of the country's finest schools are equipped with Laboratories of the new Bay City (Michigan) High School, Ask for our New catalog, No. Wiese Laboratory Engineers and Builders. Standard or Built-to-Order Educational and Technical Furni- Twelve Sales Offices throughout the Country. Address In- FACTORY: Manitowoc, Wisconsin] Please mention School Science and Mathematics when answering Advertisements. |