Quadruple expansion steam engines
The steam expands in four steps from the boiler pressure to the
exhaust pressure using one high-pressure cylinder, two different size
intermediate-pressure cylinder and one low-pressure cylinder. The cranks on the
cranshaft are shifted 90°
The steamship Inchmona owned by Hamilton Fraser & steamships Company had a five-cylinders quadruple-expansion steam-engine; one high pressure-cylinder two different sized intermediate-pressure-cylinders and two equal sized low pressure cylinders.