Restoration,--and author of _Captain Simon Suggs_, and several other good types of boilers--Aids to combustion--Boiler fittings--The safety-valve--The water-gauge--The steam-gauge--The water supply to, 39; water-tube, 21. Brakes, hydraulic, 188; motor car, 110; railway, 187; vacuum, 189, _190_, _191_. Vacuum chamber of the Erie Canal, whereby the wave-motion is always.