1851 Great Exhibition: Official Catalogue: Class VIII.: Charles Parker
From Graces Guide
67. PARKER, CHARLES, Newark, Notts — Inventor
A screw valve, consisting of a circular brass plate, of about three inches diameter and a quarter of an inch thick, having a hole in the centre to admit the valve, which is opened or closed by means of a screw attached to it; the latter works in another screw fixed on the plate, immediately over the valve-hole. Intended to supersede the present plug in ships' boats. Being a fixture it cannot be lost, as the plugs often are.
This screw-valve is large enough for an ordinary-sized boat: it is exhibited in a rough model of a boat, one foot long.
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