Professional Papers Volume 4

Professional Papers Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 edition. Excerpt: ...Ibs. Weight of ponton, = 260" Floatation of middle air-chambers, ... = 3740 Ibs. L. LOAD OF BRIDGE. 101. Passage of Infantry.---In the passage of floating bridges by infantry, it is indispensable for soldiers to march with the rout step, as the cadenced tread causes oscillations sufficiently violent to endanger the stability of the bridge. An infantry soldier, with arms and baggage, weighs 180 Ibs., and occupies in file (including interval), marching with the rout step, 2'.6. In retreat, routed, five infantry soldiers will occupy every square yard of the road-way of the bridge. With these data, we find, that each bay of bridge, with pontons 18 feet from axis to axis, will weigh, loaded with infantry, marching in file with the rout step, One abreast, - i!!-... = 1246 Ibs. xi.b Weight of bay of bridge, .. = 1560" Load of bay, with infantry, one abreast, . = 2806 Ibs. Load of bay, with infantry, two .." = 4052 ' Load of bay, with infantry, three -...== 5298" Load of bay, with infantry, four -... = 6544" Load of bay, with infantry, five..". = 7790" Load of bay, with infantry, routed, ... = 23160" From the above, we see, that with pontons 18' from axis to axis, a continuous column of infantry can pass the bridge with perfect safety, four abreast; and, with extreme care, five abreast; though the latter should not be attempted, except in very urgent cases. When the end-chambers are destroyed, a continuous file of infantry can pass, and by increasing the intervals slightly, a column, two abreast, may cross. For infantry routed, to pass with safety, would require a bridge supported by a continuous line of pontons, placed side by side, as in the formation of small rafts. 102. Passage more

Product details

  • Paperback
  • 189 x 246 x 2mm | 77g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236572858
  • 9781236572851