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OF THE

FRANKLIN INSTITUTE

DEVOTED TO

SCIENCE AND THE MECHANIC ARTS.

EDITED BY

Dr. H. W. Jayne, Chairman; Mr. Edwin Swift Balch, Ph.D., Dr. Persito;
Frazer, Mr. Louis E. Levy, Mr. James Christie, Committee on Publicationsr
with the Assistance of

Dr. Wm. H. Wahl, Secretary of the Institute.

VOL. CLXI-Nos. 961-966

(81ST YEAR)

JANUARY-JUNE, 1906

PHILADELPHIA:

Published by the Institute, at the Hall, 15 South Seventh Street

1906

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