Plaskett Report for October 1925

While the month was for most part clear, the continued warm dry weather resulted in heavy forest fires on the western coast. The smoky skies increased the exposure times several fold over the normal requirements and even then many of the plates are weak in the violet region. There were 174 plates acquired on 21 nights which is somewhat above the average of 128 plates on 15 nights for October during the past six years.

Director J. S. Plaskett obtained 49 plates on 4 nights and measured 31 spectra for radial velocity. Work on the orbits of 21 Cass and HD 191201 and wave lengths of υ Sagittarii. Handled the usual administrative work and correspondence.

[Plaskett gave a talk to Victoria RASC on a recent trip to England, Ed.]

Sat, Oct 3, 1925 – 20 · The Victoria Daily Times (Victoria, British Columbia, Canada) ·

[Plaskett was among those receiving the first Honorary degrees from the University of British Columbia, Ed.]

Sat, Oct 17, 1925 – 12 · Times Colonist (Victoria, British Columbia, Canada) ·

Assistant Director W. E. Harper observed 7 nights securing 45 plates. Measured 91 spectrograms for radial velocity. Obtained the period for Boss 5579.

Research Astronomer H. H. Plaskett worked 3 nights securing 18 spectra. Day work has been devoted to obtaining and testing a theory for the wedge to include the effect of internal reflections when the incident light is other than parallel. The adopted formula will yield transmitted intensity correct within a second order quantity, and is applicable equally when the light is diffused through the wedge by an opal glass or transmitted by the 72-inch mirror.

Assistant Astronomer J. A. Pearce observed on 6 nights obtaining 54 spectrograms. Worked on the spectroscopic and photometric orbits of HD 1337.

Astronomical Computer S. N. Hill measured and reduced for radial velocity 39 B-type spectrograms. Working on the period of HD 214240. Computing normal equations for HD 191201.

Observing Assistant R. M. Petrie worked 1 night securing 8 spectrograms. Assisted another night.

Senior Clerk Typist Miss H. R. Keay handled the usual reports, correspondence, accounts and plates. Read the proof of Volume III, Number 9. Filed catalogues and reprints. Typed an orbit for Mr. Harper and made our three reference tables.

Instrument Make Foreman T. T. Hutchison assisted in observing 15 nights. Some work releasing the shutter and adjusting the lower wind screen on the dome.