Preparing the charge, 161 Progress of the siege, 12 Proofs, bomb, 25 Proofs, splinter, 23, 48, 50 Provisions and supplies, 101 Push pick, 136 R Radius of explosion, 119 Radius of rupture, 120, 128, 131 Railroads, demolition of, 183 Rate of advance of galleries, 157 Rate of advance of sap, 29 Regular approaches, 12 Requirements, general, of siege batteries, 42 Returns, 150-1 Rifled mortars and howitzers, batteries of, 83 Rolling-stock, demolition of, 184 S Sand-bag fork, 13 Sap, attack by, 91 Sap, definition, 27 Sap, blinded, 35 Sap, breaking out from a parallel, 30 Sap, double, 32-3 Sap-fork, 13 Sap, flying, 20, 22 Sap, full, 28-30 Sap, shallow, 31 Sap-shield, 13, 23 Sap, traversed, 33-5 Sap, widening the, 30 Sapping, definitions, etc., 27 Sapping, former methods, 36 Scraper, 13 Screens, 45 Second artillery position, 81 Second artillery position, opening fire from, 83 Second parallel, 85 Shaft, definitions and dimensions, 119, 138 Shaft à la Boule, 156, 172 Shaft intervals, 142 Shaft linings, 139-141 Shaft mines, 172