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An experiment on the reactions of frogs' muscles in the science building at Iowa State College. Ames, Iowa

An experiment on the reactions of frogs' muscles in the science buildi...

Public domain photograph of college lab, free to use, no copyright restrictions image - Picryl description

Buffalo, New York. Lakeview nursery school for children of working mothers, operated by the Board of Education at the tuition fee of three dollars weekly. Reactions to Mother Goose during morning play period

Buffalo, New York. Lakeview nursery school for children of working mot...

Picryl description: Public domain image of children, kids, free to use, no copyright restrictions.

Dr. D.C. Bardwell, of the Research Lab. of the U.S. Bureau of Mines, collecting gaseous radium emanation. The radium is in the little safe at the right. Collections are made at intervals of from 4 to 10 days. The gas is drawn off under vacuum and purified by a liquid air refrigeration. The purified gas, very small in volume but powerful in its action is used in the study of gas reactions. The work is under the direct supervision of Dr. S.C. Lind, chief chemist of ther Bureau of Mines

Dr. D.C. Bardwell, of the Research Lab. of the U.S. Bureau of Mines, c...

Public domain photograph of laboratory, free to use, no copyright restrictions image - Picryl description

Fever machine used to kill germs, Wash. D.C. Bennie Smith, an arthritis patient, receives treatment at Gallinger Municipal Hospital in the fever machine used to raise temperatures artificially. With his temperature at 105 he grins and asks for more ice. Nurse-technician Ida Louise Rivers is counting his pulse while Dr. Edgar Babcock, superintendent, observes reactions. The artificial fever has been of definite benefit to this patient, the doctor said. It is also believed that this artificial fever will kill other germs, including those causing paresis. The machine was invented and developed by Charles F. Kettering in [...]

Fever machine used to kill germs, Wash. D.C. Bennie Smith, an arthriti...

Public domain historical photo, free to use, no copyright restrictions image - Picryl description

[Scientific apparatus used by Lavoisier in studying chemical reactions in combustion of substances, including mercury, top right] / Paulze Lavoisier, sculpt.

[Scientific apparatus used by Lavoisier in studying chemical reactions...

Illus. in: Traite elementaire de chimie / Antoine Laurent Lavoisier. Paris : Cuchet, 1789, plate 4. Published in: The tradition of science / Leonard C. Bruno. Washington, D.C. : Library of Congress, 1987, p. 187.

Buffalo, New York. Lakeview nursery school for children of working mothers, operated by the Board of Education at a tuition fee of three dollars weekly. Reactions to Mother Goose during morning play period

Buffalo, New York. Lakeview nursery school for children of working mot...

Picryl description: Public domain image of a school, preschool, children, education, free to use, no copyright restrictions.