r on the keelsons . Raised parts should be left on the casting at all the places where the bolts are arranged ; in this way an even face is easily made for screwing the nuts up against , which helps to secure first - rate work . The cylinder cover should be a deep and strongly - ribbed casting ,… … Fig . 269 . — Cylinder Covers . a a , Covers , b b , Manhole covers . c c , Recesses for piston - rod nuts . d , Recess for air - pump rod nut . e , Hole for relief . f , Recess for single piston - rod nut . more especially with large and heavy covers . The number of bolts should be carefully…
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