The average observing time for April for seven years is 13 nights and the average number of plates secured 150. This month conditions were above the average and with the mirror recently silvered, the satisfactory number of 183 plates was secured on 21 nights.
Director J. S. Plaskett obtained 43 spectrograms on 4 nights and measure 31 for radial velocity. Examined and measured several peculiar spectra. Handled the usual administrative work and correspondence
Assistant Director W. E. Harper worked 5 nights obtaining 48 spectrograms. He measured 37 for radial velocity. Determined the periods of, made the necessary least-squares solutions for and wrote up for publication the orbits of two stars HR 2962 and Boss 1275.
Research Astronomer H. H. Plaskett Worked 6 nights obtaining 41 spectra. Day work principally devoted to atomic physics and the theory of stellar atmospheres.
Assistant Astronomer J. A. Pearce observed on 5 nights, obtaining 44 spectra. Measured 22 plates for radial velocity. He worked on the orbit of HD 19820
Astronomical Computer S. N. Hill measured 36 B-type spectrograms for radial velocity. Preparing cards for B9 observing program, right ascension and declination to latitude and longitude. Working on the period of spectroscopic binary HD 214240
Senior Clerk Typist Miss H. R. Keay handled the usual plates, accounts, correspondence and reports. Typed the orbit of HR 2962 for Mr Harper. Work on card catalogue of mailing list.
Instrument Maker Foreman T. T. Hutchison assisted in observing on 18 nights. Repairing dome cable and wind screens.