Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 139
g the point A about two inches above the top 126 Steam Engineering row of tubes. The clamp thus formed is filled with acourse of side arch fire brick, Fig. 50, and will form acomplete and self-sustaining arch, the bottom, B, restingon the back wall, and the top, A, supported by an angleiron riveted… … Fig. 51 wall to the other across the rear end of the boiler. A fifty-four-inch boiler would thus require six clamps, a sixty-inch boiler seven clamps, and a seventy-two-inch boilerwould require eight clamps; the length of a fire brick beingabout nine inches. In case of needed repairs to the backend…
