Plaskett Report for September 1928

While the number of nights observing obtained, 20, was up to the average, the smoky skies cut down the number of plates secured, 133 spectra were secured with a total exposure time of 133.5 hours as compared with the nine-year average for the month of 170 plates and 145.8 hours.

Approximately 3820 persons visited the observatory during the month.

Director J. S. Plaskett on leave, return later date

Acting Director W. E, Harper observed 5 nights securing 27 plates. Measured for radial velocity 28. Some time given to plans for cement piers for telescope and sun dial. Usual correspondence and administrative duties. Gave one seminar talk.

Astronomer H. H. Plaskett resigned from staff

Astronomer J. A. Pearce observed 5 nights, obtaining 41 spectrograms for radial velocity. Prepares 22 pages of tabular material for the 1929 Observer’s Handbook. Marked 35 examination papers – University of Toronto Teachers’ Course in Astronomy. Gave one seminar talk on “Nova Geminarium II, 1912.

JAP Class - Toronto

JA Pearce with the class of Teacher’s Course in Astronomy

Astronomer C.S. Beals worked 3 nights obtaining 4 plates of 10th and 11th magnitude stars. Measured 9 plates to determine absolute wave-lengths of Wolf-Rayet bands. Examined all Wolf-Rayet spectra available for the purpose of working out in more detail the classification of these objects and for the purpose of identifying lines in the spectra of numerous ions. Searched the literature on the following subjects: relation of Nova spectrum to the Wolf-Rayet spectrum relation of spectra of planetary nebulae to Wolf-Rayet spectrum. The application of the X-ray doublet laws to the separations in optical spectrum.

Astronomical Computer S. N. Hill derived position angle X for B-type stars and checking similar data previously obtained. Computing τ and υ components for early b-type stars.

Senior Clerk-Stenographer Miss L. M. Blake handled the usual correspondence, reports, accounts, envelopes for spectrograms. Library assistance and catalogue of mailing list. Proof-read Volume IV, Numbers 6 and 11

Temp. Assistant P. M. Millman worked 1 night, obtaining 1 plate. Measured 12 plates. Work on card catalogue and periods of 190429S and HD 189178

Asst. Astronomer R. O Redman worked 6 nights obtaining 40 plates including 16 of Y Cygni, 2 of SX Cassiopeiae and 13 of B-type stars. The latter were taken on panchromatic plates in order to investigate the detached D lines of sodium. Measured 30 plates

Instrument Maker Foreman T. T. Hutchison assisted in observing 12½ nights. Kept telescope and measuring machines in working order