able washer , the whole being inclosed within the hollow boss properly strengthened in the casting . The mode of attaching the blades to the boss is by a cotter passing through the shank and boss , and held in position by nuts and lock nuts at each end , bearing on washers , the hole being cut of a… … Fig . 369 . — Bolt Fastenings . Fig . 370 . — Bolt Fastenings . a , Boss , b , Blade , c , Bolt . d , Plate . A , Boss , b , Blade , c , Plate . d d , Bolts . e , Guard plate . e , Guard plate . the blade can then be firmly held in the proper position by driving in wedge pieces between the boss and…
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