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In page Rifled breech loader:
"While working as a weapons designer for Thorsten Nordenfelt in London, Axel Welin solved this problem in 1889–1890 with his stepped interrupted screw Welin breech block. This had threads in sets of steps of increasing diameter so that instead of only half of the screw being threaded, the fraction threaded was number of steps / (1 + number of steps): i.e. if the block of a large gun had four steps of threads, 80% of the screw was threaded, allowing a much shorter screw and hence breech block. This allowed the block to be unscrewed and swung out in two motions – the "two motion interrupted screw" breech.
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