3öo MODERN STEAM PRACTICE . the cap with bolts for screwing up the brasses . An oil chamber should be forged on the cap and then bored out , or a seoarate oil cup fitted with a siphon wick , for lubricating the crank pin . The air - pump rod crosshead is simi - larly constructed , with aT piece… … Fig . 240 . — Air - pump Rod Crosshead . Fig . 241 . — Air - pump Rod , bottom end . a , Crosshead of brass , b , Cap . c c , Bolts and a , Rod . b , Inside rod . c , Jib and cotter . nuts . d , Rod . d , Bush . hollow , and is fitted with a Steel bar inside , so as to be able to adjust the wear of…
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