Excerpt from The Construction of the Modern Locomotive, Vol. 6 After the plates are drilled they are marked for lap by using the butt strip template at each end, thus - The template is laid on and steadying pins put through the holes, the ends marked with a scriber, and then either a long straighbedge and scriber, or a chalk line is used, the plates having been drilled as far as possible to admit of shearing on two edges only, one side and one end. At the same tims, the second barrel plate is marked for punching out the dome hole, which is not removed until after the plate has been bent, being held from four opposite points; and the third barrel-plate is marked for punching the clearance for the saddle or throat-plate, which is removed entirely before bend'mg, The plates are then sheared and punched, leaving g inch or fig inch for the planing machine. In all boiler shops there are plate edge planing machines to plane edges from 10 to 20 feet, some with turnover tool boxes, some with quick return; the former should be used wherever possible, because of the great saving of time, not to mention wearing the back edge of the tool, for there are very few side planers fitted with spring boxes to lift the tool completely away from the work upon the quick return. Others are provided with the vertical lathe arrangement, and finally, the plate edge and butt planing machine When planing the limb or 135 inch from the edges of the plates, the tool is ground to an angle of about one in eight, and the edge of the plate must have the inclination of this angle, according to its eventual position, to suit the fullering; that is, the inside lap is planed to the opposite inclination of the outside lap, clearly shown in Figs. 1 - 4 and 11 - 13. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.

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