Physics

TOWER, SMITH, TURTON, AND COPE
( See p.441 ) Three-color Printing Y. Yellow impression; negative made through a blue-violet filter. R. Crimson impression; negative made through a green filter. RY. Crimson on yellow. B. Blue impression; negative made through a red filter. YRB. Yellow, crimson, and blue combined; the final product. (Courtesy of Phototype Engraving Co., Philadelphia.)

WILLIS E. TOWER, M. SCI. (Univ. of Illinois) HEAD OF THE DEPARTMENT OF PHYSICS, ENGLEWOOD HIGH SCHOOL, CHICAGO
CHARLES H. SMITH, M. E. (Cornell) HEAD OF THE DEPARTMENT OF PHYSICS AND ASSISTANT PRINCIPAL, HYDE PARK SCHOOL, CHICAGO
CHARLES M. TURTON, A. M. (Syracuse) HEAD OF THE DEPARTMENT OF PHYSICS, BOWEN HIGH SCHOOL, CHICAGO
IN COLLABORATION WITH
THOMAS D. COPE, Ph.D. (Pennsylvania) ASSISTANT PROFESSOR OF PHYSICS, UNIVERSITY OF PENNSYLVANIA
BASED UPON PRINCIPLES OF PHYSICS BY TOWER, SMITH and TURTON
WITH 7 PLATES AND 448 OTHER ILLUSTRATIONS
PHILADELPHIA P. BLAKISTON'S SON & CO. 1012 WALNUT STREET