There are two principal kinds of tube expanders, in one of which small rolls travel around the bore of the tube and expand it, while in the other a number of segments, held together by a spring, are forced outwards by a mandrel driven in by hammer blows.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
It was rumoured sometimes that Miss Teddington, with her eye on the past, contemplated a revival of backboards, stocks, and chest-expanders; but those instruments of torture, fortunately, never made their appearance, much to the relief of the intended victims, who had viewed their advent with apprehension.
"For the Sake of the School"
Angela Brazil
How pathetic that even after his death he is not spared from spoiling but that the last clear streams of his prophesying must run out, as we have seen, in the sands of those expanders!
"Jeremiah"
George Adam Smith