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Devoted to Science and the Mechanic Arts
EDITED BY MAJOR R. B. OWENS, E.E., M.A., D.Sc., F.R.S.C.
A Method for the Determination of the Relation Between Vapor Pressures
and Their Corresponding Temperatures at Pressures of Less than Five
Millimetres
W. R. HAM, J. C. CHURCHILL AND H. M. RYDER
Sir William Ramsay
RICHARD B. MOORE
Physics of the Air . .
57
Notes from the Research Laboratory, Eastman Kodak Company:.
The Effect of the Iron Content of Ammonium Persulphate on Its Photographic Reducing
Power.
115
Revised Formula for Luminosity Curve Solution for Physical Photometry.
Notes from the Physical Laboratory of the United Gas Improvement
Company:
121
Experiments on the Black Body at the Melting Point of Platinum as a Fixed Point in
Photometry.
The Franklin Institute:
125
Members of The Franklin Institute Who Are in the Active Military or Naval Service of the
United States Government or Are Doing Civilian Work for the Government.
Committee on Science and the Arts, Stated Meeting, June 5, 1918.
Membership Notes.
Library Notes.
THE FRANKLIN INSTITUTE OF THE STATE OF PENNSYLVANIA, PHILADELPHIA
FIVE DOLLARS PER YEAR (Foreign Postage Additional).
Entered at the Post office at Philadelphia, Pa., as second-class matter.
SINGLE NUMBERS, FIFTY CENTS
Copyright, 1918, by THE FRANKLIN INSTITUTE
Acceptance for mailing at special rate of postage provided for in section 1103. Act of