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1870s Joseph Jessop, engineer, became a partner in Leicester of the Appleby brothers of London; he specialised in steam cranes.
1880 Dissolution of the Partnership between Joseph Jessop, Charles James Appleby, and Thomas Hodgson Appleby, carrying on business as Engineers and Millwrights, under the style or firm of Joseph Jessop, at the London Steam Crane and Engine Works, Leicester. All debts due to and owing from the said partnership will be received and paid by the said Joseph Jessop, who will continue the business on his own account, under the style or firm of Joseph Jessop and Son.
1880 The Leicester business became Joseph Jessop and Son.
Messrs Jessop and Son were the sole makers in Great Britain of engines fitted with the Collman gear, and had constructed and installed 750 by 1888.
1880s Made gantries used for the erection of bridges in India supplied to Mr Sullivan; others ordered by General Browne
1888 Compound condensing engines fitted with Collman's valve gear installed at the grain store of the Guinness brewery, Dublin. The cylinders are 14 and 20 inch with a stroke length of 28 inches. The engines give 87 revolutions per minute and transmit their power from the fly wheel to the counter shaft by two steel wire ropes running in leather-lined grooves. The working steam pressure is 150 lbs and the the indicated horse-power is 150.