Manual of military engineering . Tx^.4-: ^^?o. ^o^vd&r. -4 14 i^ ^ MB / 5^ no/hag holds about 50 lbs of Gunpotvder. We»l<riS/»l»*iJi. Lf ^OO. Y^jo.^it^ pa^f^ s^. CHAPTER XVI.—HASTY DEMOLITIONS. 89 213. Where there is a series of arches, as in a viaduct, the Brick anca best result is got bv cutting the piers and so bringing down two masonry archb rid res. arches for each charge, but in hasty demolitions this can only ^ be done when the piers are thin and high. 214. The best explosive to use for this purpose is guncotton. High andThe charge should be placed w^here the section of the pi
Manual of military engineering . Tx^.4-: ^^?o. ^o^vd&r. -4 14 i^ ^ MB / 5^ no/hag holds about 50 lbs of Gunpotvder. We»l<riS/»l»*iJi. Lf ^OO. Y^jo.^it^ pa^f^ s^. CHAPTER XVI.—HASTY DEMOLITIONS. 89 213. Where there is a series of arches, as in a viaduct, the Brick anca best result is got bv cutting the piers and so bringing down two masonry archb rid res. arches for each charge, but in hasty demolitions this can only ^ be done when the piers are thin and high. 214. The best explosive to use for this purpose is guncotton. High andThe charge should be placed w^here the section of the pier is thin piers,smallest, and if possible a groove should be cut in the pier to G-place the charge in ; this reduces T and also to some extent co*^*^<^^tamps the charge. Otherwise the charge should be tied in acontinuous strip along a board, and this fixed on to the pier with the guncotton next it (PL 70, Fig. 1, and PL 69, Figs. 1 and 2). 215. The piers cannot be satisfactorily demolished with Gun-gunpowder in haste, as the speediest method
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