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SEVENTH ANNUAL MEETING, OPTICAL SOCIETY OF AMERICA

AND

EXHIBIT OF OPTICAL INSTRUMENTS

AT

THE NATIONAL BUREAU OF STANDARDS

WASHINGTON, OCT. 26-28, 1922

Rh

EDITOR-IN-CHIEF: PAUL D. FOOTE

Associate Editors:

Published Monthly by the

OPTICAL SOCIETY OF AMERICA

OFFICE OF PUBLICATION:

GEORGE BANTA PUBLISHING COMPANY

MENASHA, WISCONSIN

Entered as second-class matter May 31, 1921 at the postoffice at Menasha, Wis., under the act of March 3, 1879.