# Journal of the Optical Society of America/Volume 6/Issue 6

SEVENTH ANNUAL MEETING, OPTICAL SOCIETY OF AMERICA AND EXHIBIT OF OPTICAL INSTRUMENTS AT THE NATIONAL BUREAU OF STANDARDS
WASHINGTON, OCT. 26-28, 1922
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 | Report of Committee on Colorimetry for 1920-21 | 527 |
| | L. T. Troland, Chairman | |
| Heteromorphies Due to Variation of Effective Aperture and Visual Acuity | Heteromorphies Due to Variation of Effective Aperture and Visual Acuity | 597 |
| | K. Horovitz | |
| The Absorption of the Eye for Ultra-Violet Radiation | 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 | 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 | 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 | An Improved Form of Nichols Radiometer | 625 |
| | B. J. Spence | |
| A Portable Seismometer | A Portable Seismometer | 629 |
| | P. G. Nutting | |
| An Instrument for the Gamma Ray Measurement of the Radium Content of Weakly Active Materials | 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 | The Effect of a Photo-electric Material on the Thermo-electric Current in High Vacuum Audion Bulbs | 639 |
| | Theodore W. Case | |
| Direct Capacity Measurement | Direct Capacity Measurement | 641 |
| | George A. Campbell |
| Notices | 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.
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This work was published before January 1, 1929, and is in the public domain worldwide because the author died at least 100 years ago.
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