SEVENTH ANNUAL MEETING, OPTICAL SOCIETY OF AMERICA
AND
EXHIBIT OF OPTICAL INSTRUMENTS
AT
THE NATIONAL BUREAU OF STANDARDS
WASHINGTON, OCT. 26-28, 1922
Volume VI
Number 6
Journal
of the
Optical Society of America
and
Review of Scientific Instruments
EDITOR-IN-CHIEF: PAUL D. FOOTE
Bureau or Standards, Washington, D.C.
Assistant Editor-in-Chief and Business Manager: F. K. Richtmyer
Cornell University, Ithaca, N. Y.
Consulting Business Manager, M. E. Leeds, Philadelphia, Pa.
Associate Editors:
| Term Ending Dec. 31, 1923 |
Term Ending Dec. 31, 1925 |
Term Ending Dec. 31, 1927 |
| H. D. Curtis | G. K. Burgess | W. T. Bovie |
| E. P. Hyde | K. T. Compton | H. G. Gale |
| Paul E. Klopsteg | L. R. Ingersoll | Herbert E. Ives |
| L. Silberstein | C. E. K. Mees | W. B. Lancaster |
| L. T. Troland | C. E. Mendenhall | P. G. Nutting |
| F. E. Wright | D. C. Miller | J. P. C. Southall |
AUGUST, 1922
| Report of Committee on Colorimetry for 1920-21 | 527 | |
| L. T. Troland, Chairman | ||
| Heteromorphies Due to Variation of Effective Aperture and Visual Acuity | 597 | |
| K. Horovitz | ||
| The Absorption of the Eye for Ultra-Violet Radiation | 605 | |
| Winifred P. Graham | ||
| INSTRUMENT SECTION | ||
| A New Principle and Its Application to the Lummer-Brodhun Photometer | 615 | |
| E. P. Hype and F. E. Cady | ||
| An Electromagnetic Method of Detecting Minute Irregularities in Curvature of Metallic Spheres and Cylinders and of Controlling the Oscillations of a Mass of Metal Suspended by Means of a Torsion Fibre | 620 | |
| Alexander Marcus | ||
| An Improved Form of Nichols Radiometer | 625 | |
| B. J. Spence | ||
| A Portable Seismometer | 629 | |
| P. G. Nutting | ||
| An Instrument for the Gamma Ray Measurement of the Radium Content of Weakly Active Materials | 633 | |
| N. Ernest Dorsey | ||
| The Effect of a Photo-electric Material on the Thermo-electric Current in High Vacuum Audion Bulbs | 639 | |
| Theodore W. Case | ||
| Direct Capacity Measurement | 641 | |
| George A. Campbell | ||
| Notices | 659 | |
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.
