Some big mill engines had a special fitting.
Most governors on large mill engines were belt driven.After a few misadventures in early years when belts came off and engines ran away to destruction a special fitting was added to many. The name Musgrave comes to mind here. It was apparently a giant clockwork motor geared to rapidly close a stop valve on the main supply to the engine, It was triggered by breakage of the belt driving the governors and/ or by various other emergency stop handles strategically placed. I believe that later devices were electrically driven. Hope this is of interest David Powell.
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