Requesting that his claim for finding longitude by soundings, which he had submitted before the Lords of the Treasury, be presented to the Board of Longitude. He also states that he had left a model for their inspection.

Enquiring about when and where he should leave his model instrument for inspection by the Board of Longitude.

Requesting that the Board of Longitude inspect a model he had submitted for determining longitude by means of a deep sounding.

Enclosing a proposal for the attention of the Board of Longitude.

24 letters, with related papers and observations.

About forwarding a paper on occultations and longitude.

Concerning the price of a six-foot mural circle (seven hundred and fifty guineas) and the time required to make it (about two years).

Concerning his progress on the six-foot mural circle for the Cape Observatory and requesting £200 for his work.

Concerning his progress on the six-foot mural circle for the Cape Observatory (which was half made) and requesting £200 for his work.

Informing him that the six-foot mural circle for the Cape Observatory was complete and requesting payment.

Enquiring whether the changes he had made to the Greenwich mural circle should also be made to that for the Cape Observatory, and also enquiring about making spare pieces or parts.

On finding the longitude by altitudes of celestial objects.

Twenty letters, a plan and one report, sent by various correspondents.

Includes accounts of the rates of chronometers, reports on chronometer trials, and eleven related letters.

Includes accounts of the rates of chronometers, reports on chronometer trials, and eleven related letters.

Two letters and a set of tables.

Two letters on finding longitude by an 'astral timekeeper' and star tables. For related letters from Waldron, see also [RGO 14/40: 487-493].

Concerning a model of his instrument and his previous correspondence with John Pond.

Preceded by an example of the use of his instrument to find the latitude by time and a single altitude of the sun.

Originally enclosing papers on finding longitude.

Outlining his proposals for finding longitude and enclosing a chart.
Note: folios 67-69 were originally bound in the wrong order and should be read 69, 67-68.

Proposing the use of a mechanical apparatus which could be 'affixed' to a ship to measure its progress, with the distance travelled then used to determine longitude.

Six letters and a paper sent from William Garrard, a schoolmaster at the Royal Naval Asylum and former assistant to Dr Maskelyne, with a related note from John Croker.

Originally enclosing the letter at [RGO 14/35: 383-384] and paper at [RGO 14/35: 387-395].

Six letters and a paper sent from William Garrard, a schoolmaster at the Royal Naval Asylum and former assistant to Dr Maskelyne, with a related note from John Croker.