4. In names of mechanical appliances that trip or are tripped (cf. tripv. 14); as tripping-coil, tripping-lever, tripping-relay ( Cent. Dict., Suppl. 1909); tripping-valven. see quot. 1877.
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1877 E. H. KnightPract. Dict. Mech.Tripping-valve, one moved recurrently by the contact of some other part of the machinery.