deck , and the lateral strain imparted from the headstock is taken on them , wedge pieces being introduced between them and the Cast ing . As the strain is fore and aft , these engine beams should be made broad in the direction of the length of the vessel . The hatch - way for the headstock cuts… … fitted with brass bushes for the Fig . 234 . — Main Cranks . a a , Main cranks . b , Crank pin . c , Bush . reception of the ends of the d , End plate . pins , in which they work quite loosely , thus preventing any undue stress on the main shaft in a heavy sea . Piston ring and block . — We now…
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