I know a triple-expansion ass not a hundred miles from here; so fire away.
She is barquentine rigged, and has triple-expansion engines giving her a speed under steam of nine to ten knots.
The triple-expansion engine is cutting down ocean freight, making distance of no account.
How does a triple-expansion engine differ from an ordinary steam-engine?
The ship was driven by steam, the triple-expansion engine being 500-horse power and the rate of speed twenty-five miles an hour.