A rare and most important work by Alexander Cumming.
Quarter leather bound boards, 192 pages plus index, 16 folding plates and the rare errata sheet, as included with what is thought by some to be a second issue in the same year - I presume an errata sheet was hurriedly composed shortly after publication and included when binding as soon as it became available. Printed for the author, 1st and only edition, London 1766.
Originally from Scotland, Cumming moved to London and, backed by John Stuart, 3rd Earl of Bute, became one of the capitol's leading watch and clockmakers, one of the examiners of Harrison's timekeeper (H4) for the Board of Longitude, as well as the maker of a series of superb barograph clocks, the first of which was made for the King. Long misunderstood, and dismissed by Baillie, this book is essential reading regarding 18th century English horology, especially with regard to Cummings 'improvements' on the inventions of others.
Ex Society of Arts Library copy, the front board with their bookplate and the title page with their stamp. Spine cracked and boards holding by their tapes only, and the title page detached but with no loss. Some general browning but otherwise a very good copy with untrimmed (some uncut) pages, the plates being in much better condition than usually found. Highly recommended and well worth repairs to the present binding.
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