Plaskett Report for June 1930

The month was a little below the average for observing. On 19 nights with 87.2 hours observing, 83 plates were secured. The eleven-year average for the month shows 20 nights, 90.1 hours and 121 spectra acquired.[

[Four temporary appointments were made at the Observatory as noted in the June 17, 1930 article, Ed.]

Tue, Jun 17, 1930 – 20 · The Victoria Daily Times (Victoria, British Columbia, Canada) ·

Director J.S. Plaskett on leave

Acting Director W.E. Harper worked 6 nights securing 16 plates. Measured 31 for radial velocity.Attended Eugene meeting AAAS and presented own paper and two others of members of staff. Gave two seminar talks. Silvered both mirrors. Handled the usual administrative duties and correspondence in director’s absence.

Tue, Jun 17, 1930 – Page 2 · The Eugene Guard (Eugene, Oregon) ·

Astronomer J.A. Pearce observed 4 nights and 1 afternoon. Obtained 21 spectrograms. Measured 12 spectrograms for radial velocity. Some statistical work on the C-type stars.

Astronomer C.S. Beals observed 1 night, obtaining 2 plates. Measured 2 plates for radial velocity. Attended meeting of AAAS at Eugene and presented three papers from the DAO. Focussed grating spectrograph in third order regions λ4450-λ3900 and prepared oxygen tube fo taking high dispersion photographs. Gave one seminar talk.

Astronomer R.O. Redman worked 6 nights and obtained 31 plates. Measured 39 spectra, chiefly of standard stars to tryto find cause of systematic error in radial velocities of K stars. Assisted in recollimating stellar spectrograph and in investigating flexure in same. Commenced calibration of optical wedge.

Computer S.N. Hill did computation of proper motion of B-type stars. Checking part of same. Preparing article on Mars for publication.

Clerk-Stenographer Miss L.M. Blake handled correspondence, reports, accounts, envelopes for spectra. Typing of Volume IV, Numbers 19, 20, 21

Astronomical Assistant T.T. Hutchison assisted in observing on 13 nights. Kept telescope in working order.

Astronomer Pten Bruggabcate observed 2 nights, obtaining 13 plates. Measured 7 plates for radial velocities. Worked on the reduction of objective prism plates of the two Cepheid variables Y Opiuchi and Sagittarii

Astronomer H.H. Plaskett adjusted ultra violet spectroscope and made preliminary arrangements for standardization of plates taken with that instrument. Continued work on the reduction of solar line contours from plate obtained at Ottawa, July, 1928.

Astronomical Assistant A. McKellar in order to become accustomed to measuring spectrum plates, measured 11 plates for radial velocity. Observed on whole night andtwo nights until 11:30 PM.

Astronomical Assistant D.W. McDonald measured 8 stellar spectra for practice in calculating radial velocities. Observed parts of three nights to obtain experience in observing.