|Born||11 September 1814|
Todmorden, Yorkshire, England
|Died||20 May 1897(aged 82)|
John Ramsbottom (11 September 1814 – 20 May 1897) was an English mechanical engineer. Born in Todmorden, then on the county border of Yorkshire and Lancashire. Ramsbottom was the son of a steam cotton mill owner. He learned about steam engines, rebuilding his father's and also invented the weft fork (this has also been attributed to James Bullough) that enabled looms to be run at high speed. He also created many inventions for railways but his main legacy is the split metal piston ring, which he invented and later perfected. Virtually all reciprocating engines continue to use these today.
In 1839 Ramsbottom joined Sharp, Roberts and Company of Manchester who made both industrial stationary engines and steam locomotives, and learned of the latter. He was recommended by Charles Beyer in 1842 to become locomotive superintendent of the Manchester and Birmingham Railway (M&BR). In 1846 the M&BR merged and became the London and North Western Railway (LNWR), and Ramsbottom became District Superintendent North Eastern Division. In 1857 Ramsbottom became locomotive superintendent of the Northern Division (lines north of Rugby), based at Crewe. He is credited with designing and introducing the first water troughs to be used by locomotives to pick up at speed.
- LNWR 2-2-2 Cornwall, rebuilt to his design in 1858
- LNWR DX Goods class 0-6-0
- LNWR Problem Class 2-2-2
- LNWR 4ft Shunter 0-4-0ST
- LNWR Samson Class 2-4-0
- LNWR Newton Class 2-4-0
- LNWR Special Tank 0-6-0ST
In 1852 he invented the split piston ring, which provided a tight seal of the piston against the cylinder with low friction. His other inventions included the Ramsbottom safety valve, the displacement lubricator, the water trough, a duplex steam hammer which negated the requirement to provide an anvil ten times the weight of the hammer, wrought iron rail chairs and improvements to the Bessemer process for steelmaking.
Ramsbottom retired in 1871 after his request for a salary increase was turned down by the LNWR Board of Directors, in particular by its chairman, Sir Richard Moon. The LNWR continued to pay Ramsbottom an annual stipend after he left, valuing his expertise as a consultant if not as an employee. However, in 1883 Ramsbottom became a consulting engineer and a director of the Lancashire and Yorkshire Railway (L&YR), where his major legacy was the establishment of Horwich Works on a greenfield site near Bolton. He was also a director of Beyer-Peacock.
- For illustrations of Ramsbottom design, see "Safety Valve, Ramsbottom Valves". Henley's Encyclopedia of Practical Engineering. New York: The Normal W. Henley Publishing Company. 1908. Retrieved 13 June 2009.