Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 267
s or T-piecesare designed so that the rim is as strong at thejoints of the segments as elsewhere. It will be noticed that at the centre of thewheel there is a space left of about \ in. on bothsides of each arm. This is filled with oakum, anddriven hard after the wheel is finished and in itsplace.… … Fig. 292.
Steam-engines
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