Letter from Sir [John] Osborn to Sir Joseph [Sydney York?] concerning a letter he had received from his paymaster who was working on the magnetic compass with 'that impudent fellow Jennings'. He requests that the letter be referred to the Board of Longitude.

Letter from Mr St Durand to Captain Thomas Hurd written on behalf of Jennings who offers his expertise on the subject of magnetism. St Durand notes that since the decease of Dr Gowin Knightly [Knight] there was no one with greater knowledge on the subject than Jennings.

Letter from Mr Milton of Bedford Square, London, to Captain Thomas Hurd, forwarding a letter to be laid before the Board of Longitude.

Letter to the Board of Longitude on his discovery of a method of insulating the magnetic needle to protect the compass from the effects of magnetic deviation.

Letter to the Lord Commissioners of the Admiralty originally enclosing his observations on improvements to the log glass, log reel and log-ship, and observations on the compass. The enclosures are at [RGO 14/31: 201-203].

Expressing his dissatisfaction and surprise that the Board of Longitude would not permit him to demonstrate the utility of his inventions. He accuses the Board and Admiralty of prejudice against him and of throwing every obstacle and difficulty in his way, and states his intention of bringing his discoveries before 'a Higher Tribunal'.

Informing him that it required only common sense to see the merits of his inventions and that he was sorry the Board of Longitude was deficient in that quality.

Printed observations.

Printed observations, with additional comments on the means of improving them.

Printed observations.