O I concentration in Comet Halley
O I Fluorescene in Symbiotic Stars and Novae
O I lamba 7774 absorption as a tracer of streams and disks in nondegenerate binary stars
O I lambda 7774 Absorption as a Tracer of Streams and Disks in Non-Degenerate Binary Stars
O I lambda 8446 and NA I lambda 5893 in the quasar 3C 273
O II forbidden line and continuum structure in radio-loud QSOs to Z = 0.09
O illuminating the wires of telescopes
O instrument contrived by him, illustrative of rotation
O IV temperature determination for NGC 7662
O Lacaille's catalogue of 398 stars
O large object-glasses finished by him
O large object-glasses finished by him
O Mayer's zodiacal catalogue
O Meteors and Rainfall.
O Mr. Babbage's new machine for calculating and printing mathematical and astronomical tables, from Fr. Baily
O Mr. Dollond's improvement in the micrometer
O Mr. Pond's catalogue of 720 stars
O Napier's five circular parts
O observing the eclipses of Jupiter's satellites at sea
O occultations and eclipses observed at Palermo