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half part of a brass bush, and machined so that the other part of the brass fits in such a manner that it forms in itself a cap containing the lubricator. Two bolts, which (as the thrust is taken up by the rod) may be of small diameter, hold this cap in position. The small end is fitted with a split bush, the adjustment being made by a geared screw on its extreme end, with the spindle of the pinion carried through to the front so that a box spanner may be used. The other form of small end cannot be commended, as it is impossible to tighten the brasses without disconnecting the rod.

The type of connecting rod shown in fig. 84 is used only by Robey & Co. Since the force of the explosion is delivered to the crank on the outward stroke only, the rod may be taken as one piece; and as little or no stress is taken up by the outer brass, little strength is required in the strap, gib, and cotter. The cotter having a taper of 1 in 16, the very finest adjustments may be made. The small end is of the marine pattern, and easily tightened from the front.

Lubricator for Large End of Connecting Rod

The lubricator shown at fig. 84A is the pattern used on the large end of the above connecting rod, and the author, whilst

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making some experiments, tested one of this form upon a crank pin 2.5 inches x 3 inches running 260 revolutions per minute.

The pin was kept cool throughout a continuous run of eleven hours, during which time only 1 cubic inch of oil was used, and the results showed that the general features, including the regulation of the supply, made this one of the very best forms for the purpose.

CHAPTER IX

GOVERNORS

GOVERNORS used on gas engines are mechanical combinations in which the centrifugal force developed is balanced and opposed

FIG. 85.-RICHARDSON GOVERNOR (ROBEY & CO.)

by dead-weights, springs, or other resistance, and are mostly arranged to run at an average speed, determined by the conditions under which the engine is employed, with a margin of variation usually allowed in the design, generally ranging from 2 per cent. for engines where great steadiness is a desideratum

FIG. 86. -RICHARDSON GOVERNOR (ROBEY & CO.)

to 5 per cent. for ordinary purposes. Governors may be classified as follows:

1. The centrifugal form with (A) spring and (B) dead-weight resistance.

2. The inertia governor in its various forms.

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