Manual of military engineering . otton {see PI. 71).RmIs. 235. Two-thirds of a lb. of guncotton is necessary to destroy heavy rails. Two-thirds of a lb, is most conveniently got bycutting a l|-lb. slab into thirds, as this size fits into the webof the ordinary sized rail. Six 2-oz. primers (with the detonator in one of them) willalso do, but is not so convenient to fix. Where the chargecan be wedged between the rails at points or a crossing, aless charge will do this, as this tamps it. On the straight line the slab should be tied tight into theweb of a rail close to a chair on the same side as
Manual of military engineering . otton {see PI. 71).RmIs. 235. Two-thirds of a lb. of guncotton is necessary to destroy heavy rails. Two-thirds of a lb, is most conveniently got bycutting a l|-lb. slab into thirds, as this size fits into the webof the ordinary sized rail. Six 2-oz. primers (with the detonator in one of them) willalso do, but is not so convenient to fix. Where the chargecan be wedged between the rails at points or a crossing, aless charge will do this, as this tamps it. On the straight line the slab should be tied tight into theweb of a rail close to a chair on the same side as the strips are provided for fixing the slabs to the rail, butstring suffices (PL 72, Figs, 2 and 3), or the key may beremoved and the charge put in its place. In the hastydemolition of a railway fine care must be taken that the breakJ6 sufficiently broad, or the rails displaced, so as to ensure thestopping of traffic. An effective way of damaging a railway line is by firing I>lat^ IL GIRDER BRIDGES VrT\ I I I Wedged. J^osztioTLr o/ CTiccnaes 21X,
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