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224 MARINE REVIEW May, 192) Fig. 20--Air compressor piston and con- necting rod--Fig. 21--Crankshaft assembled in bed plate--Fig. 22--Bottom view of crankcase--Fig. 23--Rotary air-admission valve--Fig. 24--Rear view of connecting rod assembly--Fig. 25--Scavenger pump pis-_. tons and rod and end view of crankcase and bed plate assembly.