OF THE FRANKLIN INSTITUTE DEVOTED TO SCIENCE AND THE MECHANIC ARTS. EDITED BY Dr. H. W. Jayne, Chairman; Mr. Edwin Swift Balch, Ph.D., Dr. Persito; Dr. Wm. H. Wahl, Secretary of the Institute. VOL. CLXI-Nos. 961-966 (81ST YEAR) JANUARY-JUNE, 1906 PHILADELPHIA: Published by the Institute, at the Hall, 15 South Seventh Street 1906 MONTHLY, FIVE DOLLARS PER YEAR. SINGLE NUMBERS, FIFTY CENTS. Save all advz DR. H. W. JAYNE, Chairman, MR. EDWIN S. BALCH, DR. Wм. H. WAHL, Secretary of the Institute. REPORT OF COMMITTEE ON SCIENCE AND THE ARTS: Rondinella's Photo-Printing Machine. MECHANICAL AND ENGINEERING SECTION: Reinforced Concrete in Building Construction. DISCUSSION: Mr. Emile G. Perrot, Mr. Walter Loring Webb, Mr. C. A. Mica and the Mica Industry. George Wetmore Colles (to be concluded) 43 |