Plaskett Report for November 1925

The observing weather for the month was just about the average, a total of 97 plates being secured on 11 nights. The average number for the past six years is exactly the same, 97, on 13 nights. Near;y all the plates this month were secured on 5 good nights, an average of two ony being secured on the other six nights

Director J. S. Plaskett obtained 35 spectrograms on 3 nights and measured 16 spectrograms for radial velocity. Computed least-square orbits of 21 Cassiopeiae and HD 191201 and prepared former for publication. Handled the usual correspondence and administrative work.

Mon, Nov 2, 1925 – 6 · Times Colonist (Victoria, British Columbia, Canada) ·

Assistant Director W. E. Harper observed 2 nights securing 5 spectra. He measured 26 spectra for radial velocity. Working on the orbit of Boss 5579. Investigating the changes in relative intensity of component spectra for four F-type spectra made read for publication.

Sat, Nov 21, 1925 – 2 · Times Colonist (Victoria, British Columbia, Canada) ·

Research Astronomer H. H. Plaskett worked two nights obtaining one long exposure plate of Vega and 14 other spectra. Day work has been spent in determining the size of tremor discs of stars and the variation of atmospheric dispersion and extinction with zenith distance. Some experimental work has been done on the collimation of the spectroscope.

Assistant Astronomer J. A. Pearce observed on 4 nights and obtained 42 spectrograms. Worked on the orbit of HD 1337

Astronomical Computer S. N. Hill measured and reduced for radial velocity 14 B-type spectrograms. Correcting Julian Day on plate envelopes and radial velocity cards. Assisting the Director on two nights of observing. Worked on the period of HD 214240.

Senior Clerk Typist Miss H. R. Keay handled the usual plates, correspondence, accounts and reports. Typed two orbits, HR 8257 and Cor. Bor. for Mr Harper. Typed an article for the Journal of the RASC.

Instrument Maker Foreman T. T. Hutchison assisted in observing on 5 nights