Charles Allix and Peter Bonnert, Carriage Clocks, Antique Collectors' Club, 1974, pp.289-291.
Richard Thomas Jump (b.1785) joined the workshop of Benjamin Louis Vulliamy in 1812. Two of his sons, Richard Thomas and Joseph, were apprenticed to Vulliamy in 1825 and 1827 respectively, remaining with him until his death in 1854. In 1855 Joseph Jump and another brother, Alfred, set up in business as successors to Vulliamy at 1a Old Bond Street. Subsequently they were joined by Joseph's son, Henry Joseph. Alfred died in 1872. Joseph and Henry Joseph were in turn joined by the latter's son, Henry Percival in 1875.
In 1880 the firm moved to 55 Pall Mall. It was here, circa 1883 that they made the first of their famous hump-back carriage clocks. Arthur Hayton Jump (who joined in 1897) later wrote of this: 'The first of these clocks was made for a Lord Ashburton...It cost the firm a load of money in time and trouble, for so many men had to make so many parts (the man that made the hands couldn't do anything else etc., etc.) My father presented the bill to Lord A with trembling hands...Lord A took the bill and wrote out a cheque at once for double the amount charged on the bill!!!'(Charles Allix and Peter Bonnert, Carriage Clocks, Antique Collectors' Club, 1974, p.290.) In 1898 the firm moved to Mount Street, where it stayed until it ceased trading in 1934.
Amongst the finest carriage clocks ever produced, 'hump-back' carriage clocks were originally inspired by the great French clock and watchmaker Abraham-Louis Breguet (1747-1823).