W Sisson Marine Engine (No. 2601)
A three cylinder, triple expansion engine built in 1927 by W Sisson & Co. Ltd, Gloucester.
Installed in the Thames River Steamer ‘Mapledurham’, which was owned by Salter Bros, Oxford.
The engine was removed from the boat in 1958/59, eventually going to The National Maritime Museum in 1972, where it was on static display for several years.
Arrived at Markham Grange on 9th January 2002.
The engine is currently on loan from The National Maritime Museum, Greenwich, London.
Code No. EQS0113
After careful dismantling and cleaning, restoration was soon started. Several new parts and some copper pipe work had to be made, to replace those that were either missing, damaged or worn out.
It was successfully steamed again in June 2002.
Technical details
| Type of Engine | Three cylinder, inverted vertical, triple expansion engine |
|---|---|
| Builder & Year | W Sisson & Co. Ltd, Engineers and Naval Architects, Gloucester 1927 |
| Horse Power | 75 HP at 200 psi steam pressure |
| Cylinder Sizes | High Pressure (HP) is 6 ins. diameter Intermediate Pressure (IP) is 8 ins. diameter Low Pressure (LP) is 11 ins. diameter |
| Stroke | 8 ins. |
| Valves | All cylinders have piston valves |
| Other Information | Forward and astern is controlled by hand operated, Hackworth type, reversing valve gear |