|Founder||William Dent Priestman, Samuel Priestman|
|Headquarters||Kingston upon Hull, England|
|Products||Excavators, cranes, dredging machinery|
Priestman Brothers was an engineering company based in Kingston upon Hull, England that manufactured diggers, dredgers, cranes and other industrial machinery. In the later 1900s the company also produced the Priestman Oil Engine, an early design of oil fuelled internal combustion engine.
Priestman family ownership (1870–1895)
It is said the company's entry into the construction of dredging equipment began in 1876 when they were asked to construct machinery to recover lost gold from the sea west of the coast of Spain. No gold was found but the company's equipment proved useful for dredging of harbours and docks; the company pioneered the manufacture of steam powered cranes with grab (clamshell) buckets.
From 1888 to 1904 the company produced various versions of the Priestman Oil Engine, an early example of an internal combustion engine. Models were produced with engine power from 2 hp (1.5 kW) up to 60 hp (45 kW) for a double cylindered version. The company opened a factory in Philadelphia (USA) in 1892, also producing engines. In 1894 the company produced one of the earliest recorded examples of an internal combustion engine for railway, based on an 1888 prototype – the 20 h.p. two axle machine was tested on the Hull Docks.
In 1895 bad debts and a decline in sales made the company insolvent, the business was reformed but William and Samuel lost their seats on the board.
Public ownership (1895–)
The company was reformed and began business again; after the first world war its products were used in the rebuilding of French villages, in 1921 a machine for digging field drainage drains was produced and the company received investment from the Ministry of Agriculture.
In 1928 production of excavators named after animals began; models named "Lion", "Tiger" and "Panther" were produced.
In 1972 the Steels Group, Priestman's parent company, was taken over by the Acrow Group.
The Priestman division was sold off in 1984 and was eventually merged with Coles Cranes. The remnants of the company are owned by Gardner Denver, and it no longer manufactures cranes or excavators.
The Priestman Grab & VC Excavators Divisions were sold to RB International, this business continues to be supported by Delden Cranes Ltd, through their RB Cranes Division 
- "Priestman Brothers". Grace's Guide (The Best of British Engineering 1750–1960s). Retrieved 24 January 2013.
- "Priestman, William Dent". Biographical Dictionary of the History of Technology
- Dave Mark (30 August 2005). "Display tells story of iconic city company". Yorkshire Post. Retrieved 24 January 2013.
- Peter Manktelow (2001). Steam Shovels. Osprey Publishing. p. 29. ISBN 0747804834.
- "Priestman oil engine built in 1895, on display at the Science Museum, c 1990.". Ingenious. National Museum of Science and Industry. Retrieved 24 January 2013.
- Diesel Railway Traction, 17, p. 25, 1963,
In one sense a dock authority was the earliest user of an oil-engined locomotive, for it was at the Hull docks of the North Eastern Railway that the Priestman locomotive put in its short period of service in 1894Missing or empty
- Day, John R.; Cooper, Basil Knowlman (1960), railway Locomotives, Frederick Muller, p. 42,
The diesel has quite a long history, and the first one ran as far back as 1894. This was a tiny 30-h.p. two-axle standard-gauge locomotive with a two- cylinder engine designed by William Dent Priestman
- "Motive power for British Railways" (PDF). The Engineer. 202: 254. 24 April 1956.
- The Electrical Review. 22: 474. 4 May 1888.
A small double cylinder engine has been mounted upon a truck, which is worked on a temporary line of rails, in order to show the adaptation of a petroleum engine for locomotive purposes, on tramwaysMissing or empty
- "The Priestman Story". History of Coles Cranes of Sunderland. Retrieved 24 January 2013.
- "Acrow (Engineers)". Grace's Guide (The Best of British Engineering 1750-1960s. Retrieved 24 January 2013.
- "Priestman, William Dent". Biographical Dictionary of the History of Technology. Taylor and Francis. 27 June 2003. ISBN 0-203-02829-5.
|Wikimedia Commons has media related to Priestman Brothers.|