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The authors are under great obligation to all of their friends who have assisted them in this work, particularly to their collaborator, Mr. W. R. Pyle; also to Mr. J. R. Towne of East High School, Minneapolis, Mr. C. F. Dutton, of the West High School of Commerce, Cleveland, Mr. E. Waite Elder, of the Eastside High School, Denver, Mr. C. E. Harris, of the East High School, Rochester, N. Y., Mr. Walter L. Barnum and Mr. Robert E. Hughes, of the Evanston High School, Evanston, Ill., and Dr. George de Bothezat, aëronautical expert of the Advisory Commission for Aëronautics.
R. A. MILLIKAN
Liquid Pressure beneath a Free Surface. Pascal's Law. The
Definition and Measurement of Force. Composition and Reso-
lution of Forces. Gravitation. Falling Bodies. Newton's Laws
Definition and Measurement of Work. Work and the Pulley.
Work and the Lever. The Principle of Work. Power and
Thermometry. Expansion Coefficient of Gases. Expansion
Fusion. Properties of Vapors. Hygrometry. Boiling. Artifi-
Detection of Electric Currents. Chemical Effects. Magnetic
Effects. Measurement of Currents. Electric Bell and Tele-
graph. Resistance and Electromotive Force. Primary Cells.
XVIII. NATURE AND PROPAGATION OF LIGHT .
Transmission of Light. The Nature of Light
PORTRAITS OF PHYSICISTS AND ILLUSTRATIONS
OF RECENT ACHIEVEMENTS IN PHYSICS
1. The Navy-Curtiss Hydroplane, NC-4 (In colors)
5. The Mercury-Diffusion Air Pump
6. British Dirigible Airship R-34 Arriving in America
7. The United States Army Observation Balloon
9. French 340-mm. Gun in Action
24. Section of a Modern Automobile .
25. The Carburetor and an Ignition System