Background
He was born in Edinburgh in 1733, the son of James Cumming of Duthil.
He was born in Edinburgh in 1733, the son of James Cumming of Duthil.
He is recorded as having been apprenticed to an Edinburgh watchmaker.
The South-shaped trap (or bend) was invented by Cumming in 1775 to retain water permanently within the bowl, thus preventing sewer gases from entering buildings. lieutenant survives in today"s plumbing modified as a Uor J-shaped pipe trap located below or within a plumbing fixture. Cumming was a mathematician and mechanic as well as a watchmaker.
Little is known of his early life.
In the 1750s he was employed by Archibald Campbell, 3rd Duke of Argyll at Inverary as an organ builder as well as a clockmaker. After his move to England he continued to work in both fields.
The Earl of Bute and his family commissioned a series of elaborate barrel organs with which Cumming was involved. He made a barometrical clock for King George III, who paid him an annual retainer for its maintenance.
Other barometrical clocks created by him are at the Science Museum and on the Isle of Bute.
He wrote books about watch and clock work, about the effect on roads of carriage wheels with rims of various shapes, and on the influence of gravity. In 1765 he invented a clock for George III which also acted as a barometer, recording air pressure against time. This is notable as the first accurate recording barograph.
In 1766 he made a similar model for his personal use, which on his death was purchased by Luke Howard who used it for his observations within the book The Climate of London.
In 1770 he is credited with the invention of the microtome, a machine for making extremely thin slices as used in slide-preparation, in conjuction with John Hill. In 1775 he made the major advance on the design of the flushing toilet by adding the concept of water retention within the pan, preventing foul smells from re-entering the house and generally giving a "cleaner" solution.
He had a house in the district and an organ shop. In 1783 he was a joint founder of the Royal Society of Edinburgh and Cumming was made a Fellow.
In 1788 Cumming is recorded as a watch and clock-maker on Bond street in London, responsible for the design and manufacture of a church organ for the Church of the Holy Trinity in Christchurch, Cambridgeshire, having earlier created a "self-acting mechanism" already used for an organ for the Earl of Bute in 1787.
In 1814 his final patent appears to be for "antisymmetrical bellows" for organ-use. He died on 8 March 1814.
By 1763 he had premises in Bond Street, London, and "had acquired a sufficient reputation to be appointed a member of the commission set up in that year to adjudicate on John Harrison"s ‘timekeeper for discovering the longitude at sea’".
