JOSEPH S. KEEN, JR., Pres't & Gen'l Manager. H. BAYARD HODGE, Sec'y & Ass't Treas. American Pipe and Construction Company Engineers and Contractors 112 North Broad Street Apparatus for the measurement of resistance, capacity and inductance. Temperature measuring devices. Cable testing apparatus. Electrical measurements laboratories equipped. Gilbert D. Emerson 209 North Eleventh St. PHILADELPHIA, PA. LIBRARY BOOK BINDER DIRT AND FINGER-MARKS SUCCESSFULLY 88 The McDaniel Improved Steam Trap DISCHARGES CONTINUOUSLY AND NEVER BLOWS STEAM WATER GAUGES ARE USED TO SHOW THE WORKING OF THE TRAP Made Extra Heavy for High Pressure We also manufacture Reducing Valves, Exhaust Pipe Heads, Separators for Live and Exhaust Steam, Blow Off Valves, Relief Valves, Ejectors, Pump Governors, SEND FOR CATALOGUE. etc. WATSON & MCDANIEL CO., 146 N. 7th Street, Philadelphia, Pa. Your courtesy in mentioning the Journal will be appreciated No. 911 Arch St., Philadelphia, Pa., U. S. A. TESTING MACHINES and HYDRAULIC PRESSES We are always prepared to make tests of all kinds 500 North Twelfth Street, Philadelphia, Pa. MINIATURE PRECISION INSTRUMENTS For Direct Current The same degree of mechanical and electrical excellence which has won pre-eminence for the larger Weston Models, is embodied in these wonderful little masterpieces of the instrument maker's art. The finest watch is a less striking example of perfection in refined workmanship. They are accurate, dead-beat, extremely sensitive. They are shielded against external electrical and magnetic influences. Despite their great refinement in workmanship, they are very substantially constructed and have the longest scale ever provided in instruments of similar size. In short, they are the finest development of small instruments of the pivoted moving coil, permanent magnet type. And the prices are low. The several models and ranges offer a selection from over 300 different combinations. The switchboard instruments are listed in bulletin No. 20 and portable instruments in bulletin No. 501. They will be mailed on request. JOURNAL OF THE FRANKLIN INSTITUTE DEVOTED TO SCIENCE AND THE MECHANIC ARTS VOL. CLXXX AUGUST, 1915 No. 2 THE EFFECT OF THE END CONNECTIONS ON THE DISTRIBUTION OF STRESS IN CERTAIN TENSION MEMBERS.1 BY CYRIL BATHO, B.Eng., M.Sc., Assistant Professor of Applied Mechanics, McGill University, Montreal, Canada. INTRODUCTION. THE experimental study of the distribution of stress in structural members has received considerable attention in recent years. The experiments of American investigators upon actual structures are well known. Most of these investigations, however, have been made with strain gauges, such as the Howard and Berry, which, while excellently adapted to the more or less rough determination of average strains in members of actual structures, are scarcely suited to refined measurement of the distribution of strain in a member subjected to stresses which vary considerably over the cross-section. Thus the analysis of the distribution of stress in single or built-up structural members and its modification due to different types of end connections has scarcely received the attention which it deserves from its practical importance. The optical determination of complex stress distribution in transparent materials by the use of polarized light as developed by Coker, Mesnager, Hönigsberg and others, although giving accurate results within its range, does not appear to be Communicated by Professor H. M. Mackay. 1 "See British Association Report, 1914. [NOTE.-The Franklin Institute is not responsible for the statements and opinions advanced by contributors to the JOURNAL.] Copyright, 1915, by THE FRAnklin InstituTE. VOL. CLXXX, No. 1076-10 129 |