1862 London Exhibition: Catalogue: Class VIII.: Henry Ferrabee
From Graces Guide
1851. FERRABEE, HENRY, 75 High Holborn, London.
Steam and water pressure gauges.
In these gauges the objectionable india-rubber diaphragm is dispensed with. A circular steel plate, peculiarly slit, and protected by a plate of hard rolled brass, receives the pressure of the steam, and actuates a piston, which, by means of a sector and pinion, gives motion to the dial hand. Corrosion and friction are thus obviated, and accuracy and durability ensured.