OSCILLATING ENGINES.

Now, admitting that the details to behandled, in the present instance, is more than

Fig. 61.

BURGHS DISCONNECTING CRANK.

that requisite with the ring and disc arrange-ment, there can be no question as to the com-pactness, and also the economy in material andconstruction. The illustration under directNotice is compiled from the drawings con-nected with the condenser, illustrated byFig. 44—page 199—and the principal dimen-sions are thus:—

Diameter of Shaft .Diameter of Boss .Dength of dittoDiameter of PinDiameter of Boss .Width of StrapThickness of dittoMean Width of KeyThickness of dittoDap of Strap

Ft. In.0 9£1 4£0 9f

o n1 0 £0 7J0 30 3J0 1 £0 if

TRUNNION PLUMMER BLOCK.

This detail supports the cylinder, and there-^_ re ^ of general design. The illustration,1, ^‘ i s an ordinary example. The lowerPortion is of cast iron, also the cap, and bothFned with gun metal strips for the recep-

231

tion of the trunnion bearing. It is preferredin some cases to use brasses with flangesand wrought iron caps. The cap bolts passthrough the block to the lower frame, for thepurpose of securing a connection without addi-tional detail. Especial attention also has beendevoted to the distribution of the metal; thecap is curved, and being exposed to analternate direct thrust, the thicker metal istherefore introduced at the centre. Each nut

Fig. 62 .

CYLINDER TRUNNION PLUMMER BLOCK.

is fitted with a stop ring and stud, andthe bolts have collars on them, at the con-nection of the cap with the block. To preventthe cap'being screwed down unevenly ortoo hard on the bearing, loose divisional por-tions are inserted at the connections, andsecure from lateral displacement by studs—seen in the elevation.

On each side of the sole of the block, keysare introduced, acting between the block andthe lugs on the foundation frame, and thuslateral adjustment is readily effected. The