1. A Photoelectric Sunshine Recorder;Foster;Bulletin of the American Meteorological Society,1953
2. Recording Daylight Illuminometer;Foster;Illuminating Engineering,1951
3. An Improved Water-Flow Pyrheliometer and the Standard of Radiation;Abbot;Smithsonian Miscellaneous Collections,1932
4. The Silver-Disk Pyrheliometer;Abbot;Smithsonian Miscellaneous Collections,1911