Printed letter, with autograph additions and signature, from Hall to Paterson, concerning his 'plan for the quick application of mats for stopping leaks in Iron Vessels'.

Foolscap bifolium (leaf dimensions 33 x 20.5 cm). Good, on aged and lightly creased paper. The letter, the printed text of which invites the recipient to 'forward to this Office a clear description' of his invention, is on the recto of the first leaf. Particularising details and signature by Hall, who has addressed it to 'Commander Paterson R.N. | Brockhurst House | Brockhurst | Gosport | Hants'. Docketed and initialed by Paterson at head. The recto of the second leaf contains a printed 'Memorandum' by W. G. Romaine, dated 'Admiralty, 23rd February, 1869.' This gives the 'Regulations' involved in submitting 'any invention for consideration' by the Lords Commissioners of the Admiralty.