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If you do not possess a lathe, the preparation of the spindle and mounting the wheel disc on it should be entrusted to a mechanic. Its diameter at the bearings should be 5/32 inch or thereabouts. The right-hand end is turned down quite small for the pinion, which should be of driving fit. The Blades. The metal is divided along the lines aaaa, bbbb, and ab, ab, ab, ab, etc.
The boiler is entirely enclosed, except at one end, so that the hot gases get right round the barrel, and the effective heating surface has been more than doubled by fitting a number of water-tubes, aaa, bbbb, which lie right in the flames, and absorb much heat which would otherwise escape.
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