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Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86   By:

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Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 is a fascinating collection of scientific articles and essays that covers a wide range of topics. From discussions on psychology and sociology to articles on astronomy and biology, this volume provides readers with a comprehensive overview of the scientific advancements of the time.

The articles are written in a clear and engaging manner, making complex scientific concepts accessible to a general audience. The inclusion of illustrations and diagrams further enhances the reader's understanding of the topics discussed.

One of the highlights of this volume is the diversity of subjects covered. Readers are exposed to new and intriguing ideas, making this a truly enriching reading experience. Whether you're interested in the latest developments in technology or the inner workings of the human mind, there is something for everyone in this volume.

Overall, Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 is a valuable resource for anyone interested in the world of science. The depth and breadth of the topics covered, combined with the accessible writing style, make this book a must-read for science enthusiasts of all levels.

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Scanned by Charles Keller with OmniPage Professional OCR

NOTE: degrees A (Absolute?) is the same as the current degrees K (Kelvin).

THE POPULAR SCIENCE MONTHLY VOLUME LXXXVI JULY TO SEPTEMBER, 1915

THE SCIENTIFIC MONTHLY VOLUME I OCTOBER TO DECEMBER, 1915

EDITED BY J. McKEEN CATTELL

THE SCIENTIFIC MONTHLY OCTOBER, 1915

THE EVOLUTION OF THE STARS AND THE FORMATION OF THE EARTH. II

BY DR. WILLIAM WALLACE CAMPBELL

DIRECTOR OF THE LICK OBSERVATORY, UNIVERSITY OF CALIFORNIA

THE PRINCIPLES OF SPECTROSCOPY

THUS far our description of the stellar universe has been confined to its geometrical properties. A serious study of the evolution of the stars must seek to determine, first of all, what the stars really are, what their chemical constitutions and physical conditions are; and how they are related to each other as to their physical properties. The application of the spectroscope has advanced our knowledge of the subject by leaps and bounds. This wonderful instrument, assisted by the photographic plate, enables every visible celestial body to write its own record of the conditions existing in itself, within limits set principally by the brightness of the body. Such records physicists have succeeded to some extent in duplicating in their laboratories; and the known conditions under which the laboratory experiments have been conducted are the Rosetta Stones which are enabling us to interpret, with more or less success, the records written by the stars... Continue reading book >>




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