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Volume 5(9);  September 1919
The cover of the journal
Astronomy
On the Distribution of the Aphelia of the Secondary Bodies of the Solar System
C. D. Perrine
Proc Natl Acad Sci U S A. 1919 September; 5(9): 371–377.
PMCID: PMC1091614
Recent Simultaneous Measurements of the Solar Constant of Radiation at Mount Wilson, California, and Calama, Chile
C. G. Abbot
Proc Natl Acad Sci U S A. 1919 September; 5(9): 383–386.
PMCID: PMC1091616
Geology
Discoidal Structure of the Lithosphere
Bailey Willis
Proc Natl Acad Sci U S A. 1919 September; 5(9): 377–383.
PMCID: PMC1091615
Physics
Radiation from a Moving Magneton
H. Bateman
Proc Natl Acad Sci U S A. 1919 September; 5(9): 367–371.
PMCID: PMC1091613
Rotating Projectiles from Smooth-Bore Guns
C. G. Abbot
Proc Natl Acad Sci U S A. 1919 September; 5(9): 386–388.
PMCID: PMC1091617
Means of Measuring the Speed of Projectiles in Flight
C. G. Abbot
Proc Natl Acad Sci U S A. 1919 September; 5(9): 388–389.
PMCID: PMC1091618
Journal Matter
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