Set off or Off Set
Part of pumping mechanism. The set off was usually encountered at a pole or plunger pump and was a means of connecting the plunger to the main rod. Also could be a means of connecting a balance bob.
This photograph was uploaded July 5th 2018 by royfellows.
Copyright / re-use statement: 1876 Michell & Letcher - Cornish Pitwork - Authors long dead
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