th 6 6b, and the distance between which rests on a wooden curb at the bottom of the the part, a, of the flange and the shoulder, b, of the excavation. Digging is then resumed within the stock will always define the depth of the thread, so brickwork, as far as is consistent with safety, leaving that… … intended insert, if there isto be one. When the excavation is completed and timbered to quired, the collar will be advanced or freed, so as to ator, as the mere reversing the nut, E, to admit of the full size of the section the work is ready for the press in or free the dies. The effect of this…
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