Plaskett Report for December 1925

While there was considerable clear sky in the daytime during the month, the nights were invariably cloudy until the last of the month when we were favoured with a couple of splendid nights. A total of 57 plates was secured on 5 nights as compared with an average for the past 6 years of 80 plates on 10 nights.

Director J. S. Plaskett obtained 4 spectra on 1 nights and measured 8 plates for radial velocity. Computed the orbit of Boss 3354 and prepared Boss 3354 and HD 191201 for publication. Handled the usual administration work and correspondence.

Sat, Dec 12, 1925 – 15 · Times Colonist (Victoria, British Columbia, Canada) ·

Assistant Director W. E. Harper Observed one night securing 25 spectrograms. Measured for radial velocity 24 spectra. Arranging the enlargement of four F-type spectra for publication. Spent considerable time reading recent scientific magazines. Transcribing parallax data of A-type on cards.

Research Astronomer H. H. Plaskett worked 1 night obtaining 7 wedge spectra. Completed the investigation on the sources of error in the wedge method of spectrophotometry. Re-commenced work on the nebular paper and completed the correction to the Orion plates for vignetting of the collimator.

Assistant Astronomer J. A. Pearce observed 2 nights, obtaining 21 spectrograms. Measured 13 spectrograms for radial velocity. Completed the spectroscopic and photometric orbits for HD 1337.

Astronomical Computer S. N. Hill measured and reduced for radial velocity 45 B-type spectrograms. Worked on the period of HD 214240.

Senior Clerk Typist Miss H. R. Keay handled the usual plates, correspondence, accounts, and reports. Typed the orbit of 21 Cass. for Dr. Plaskett. Read the proof of Volume III, Number 9. Some work on the cataloguing of reprints.

Instrument Maker Foreman T. T. Hutchison assisted in observing on 4 nights. Absent on sick leave for 5 days.