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direct in the part spherical cylinder heads and their stems are consequently divergent. The valves are made from special high chromium steel forgings, working in phosphor bronze guides.

CAMSHAFT AND ROCKER MECHANISM
The camshafts are inclosed in steel tubular cases, which are mounted on the top of the cylinders. Each camshaft is provided with six aluminum bearings which are in halves and bolted together, and two one-piece bearings, one at either end. 
To operate the divergent valves, tappets are interposed between the cams and each rocker, the latter being arranged to swing in the plane coincident with or parallel to a plane in which its valve lies. 
The camshafts aremachined from 5% case-hardening nickel steel bar, and ground on the bearing surfaces and cam faces. The valve rockers are 3 1/2% nickel steel forgings machined all over, having hardened ends bearing on the tappets and hardened adjustable end pieced bearing on the valve stems. 

AUXILIARY GEAR DRIVES.
The gears for driving the camshafts and all auxiliaries

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