with the buffer beams of steel, cross-stays, etc., are dealt with in the frame shop in a similar manner to the frames themselves. The riveting together of the cross-stays and frames is always done in the erecting shop, only the plates themselves being treated in the frame shop.
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Fig. 19.—Marking-Off Cylinders.
Cylinders. The cylinders are machined in a shop which contains a number of single and double boring machines, and also drilling and planing machines, all being tools of large size and most of them of special designs for locomotive work. The rough cylinder castings are lifted by a crane on to a large cast iron marking-off table, the surface of which is perfectly level. The casting is placed on planed blocks b, Fig. 19, and its level is adjusted by wedges above them. Those parts on which lines are to be marked are painted with whiting to show the scriber marks,
