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British and French patents, 1861-1862, for John Marshall's invention for 'the collection, concentration and transmission of sound, so as to facilitate the hearing.' Also includes a Belgian 'brevet d'importation.'

Letter from Charles Haley of London to Mr Whitaker [possibly John William Whittaker, scholar and Anglican clergyman, then a fellow of the College], St John's College, Cambridge, 8 Dec 1818. Discussing a watch ordered by Whitaker, asking whether he would prefer it in silver or in gold; gold would cost 12 or 13 guineas more. Haley intends to put on the crest, 'but rather delicate that it may not injure the case by taking it out, yet it shall look well'.

Autograph, with signature.

Letter from Peter Dolland of London to an unknown recipient, 20 Aug 1803. Discussing an order given for instruments, including compasses, ivory scales, and 'the case of drawing instruments which you desire in every particular to be very good and yet you seem to expect the price to be very low'. Mentioning alternative types and prices of some instruments.

Autograph, signed 'P. & J. Dollond'.