A collection of handwritten notes, including:

1. A note, dated 28 June 1734, regarding the errors of Edmond Halley's quadrant from experiments performed by Bradley.

2. A note, dated 26 July 1735, correcting the errors of the quadrant and the previous year's over-estimated calculations.

3. A note, dated 6 July 1742, on correcting errors in the quadrant and repairs to the telescope.

4. A note, dated 8 July 1742, comparing the quadrant's present position with its adjustments in 1726.

5. An undated note of c. 1742 describing Halley's observational technique and explaining the improvements devised by Bradley to aid observations in difficult weather and to refine the results that are taken.

6. Notes on the alterations to the line of collimation, 1744-1745.

7. A bound manuscript containing observations of the Pole Star and other major stars; tests on the New Quadrant; observations made with the New Transit Telescope and a description of its size and location; a law of refraction and its calculation; a note on the replacement of instruments from a £1000 grant; and separate notes on the quadrant and zenith sector calculations.