Plaskett Report for July 1928

Observing weather only slightly below the average for the month. On 25 nights with 125.4 hours observing a total of 131 plates was secured, 11 being of faint stars requiring several hours each. The corresponding average for the nine-year period is 26 nights, 137.6 hours, 211 plates

Director J. S. Plaskett is on leave of absence

Assistant Director W. E. Harper worked 4 nights securing 36 plates. Measured for radial velocity 18. Determined orbit of Boss 3180 and period of Boss 4177. Making rough drawings for six-inch mounting. Some testing work with infra red plates. Usual correspondence and administrative duties. Gave one seminar talk.

Astronomers J. A. Pearce and H. H. Plaskett on leave of absence.

Astronomer C. S. Beals observed 8 nights, obtaining 12 plates of 10th magnitude stars. Measured 4 plates for radial velocity. Plotted fields of 7 eleventh magnitude stars from measure units of Franklin Adams chart and Harvard Map of the sky. Tested infra red plates and focussed IS camera for the infra red region. Gave one seminar talk. Studied identification of Wolf Rayet emission bands with the purpose of extending identification of unknown wave lengths.

Astronomical computer S. N. Hill worked on deriving angular distance D (Star apex), position angle (Pole-star-apex) and conversion of equatorial co-ordinates into galactic co-ordinates for B-type stars.

Senior Clerk-Stenographer Miss L. M. Blake handled the usual correspondence, accounts, reports and envelopes for spectrograms, library assistance. Proof-read Volume IV, Numbers 5,6,7,8,9.

Temporary Assistant R. M. Petrie observed on 8 nights securing 47 spectrograms. Measured 37 plates for radial velocity. Worked on orbits of HR 6696, HD 199140 and HD 32990.

Temporary Assistant P. M. Millman worked 5 nights securing 35 plates. Measured for radial velocity 33. Worked on card catalogue. Investigation of comparison lines. Gave seminar talk on “Stellar Evolution”. Obtained probable period of HD 32990.

Instrument Maker Foreman T. T. Hutchison worked 20 nights and kept telescope in running order.