Physics

(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.)

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PHYSICS

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

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