. Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . 6. for the back connection, extending from the back wallto the boiler head, by taking flat bars of iron S/8 x 4 in.,cutting them to the proper length and bending themin the shape of an arch, turning four inches of eachend back at right angles, as shown in Fig. 5-. Thedistance O-B should equal that from the rear wall tothe boiler head, and the height, O-A, should be aboutequal to O-B, and should bring the point A about twoinches above the top row of tubes. The clamp thusformed is filled with a co
. Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . 6. for the back connection, extending from the back wallto the boiler head, by taking flat bars of iron S/8 x 4 in.,cutting them to the proper length and bending themin the shape of an arch, turning four inches of eachend back at right angles, as shown in Fig. 5-. Thedistance O-B should equal that from the rear wall tothe boiler head, and the height, O-A, should be aboutequal to O-B, and should bring the point A about twoinches above the top row of tubes. The clamp thusformed is filled with a course of side arch fire brick, 30 ENGINEERING Fig. 6, and will form a complete and self-sustainingarch, the bottom, B, resting on the back wall, and thetop, A, supported by an angle iron riveted across theboiler head about three inches above the top row oftubes. See Figs. 7 and 8. Enough of these arches should be made so that whenlaid side by side they will cover the distance from oneside wall to the other across the rear end of the fifty-four-inch boiler would thus require, six clamps,. FIGURE 7. a sixty-inch boiler seven clamps, and a seventy-two-inch boiler would require eight clamps; the length ofa fire b*rick being about nine inches. In case of neededrepairs to the back end of the boiler the sections canbe lifted off, thus giving free access to all parts, andwhen the repairs are completed the arches can be resetwith very little trouble and much less expense than thebuilding of a solid arch would necessitate. This formof segmental arch allows ample freedom for expansion BOILER SETTINGS AND APPURTENANCES 31 of the boiler, in the direction of its length, withoutleaving an opening when the boiler contracts. The crosswise construction of arch bars, while afford-ing equal facility in repair work, is necessarily moreexpensive than the form here described, and is alsoopen to the objection that it cannot follow the con-tracting boiler and maintain a tight joint or connectio
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