Papers on Subjects Connected with the Duties of the Corps of Royal Engineers Volume 14

Papers on Subjects Connected with the Duties of the Corps of Royal Engineers Volume 14

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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. 1865 edition. Excerpt: ...their base is 10 centimetres, 10 therefore--1--6--2 = 6'! layers, must be put on one another.' Weight with 3'8 metres width or bearing, and 1 metre breadth: --1 bar 4'2 metres long weighs 4-2 X 88 = 160 kilogrammes; therefore 10 placed side by side = 1600, and 6 layers of them = 9600 kilogrammes. To ensure them as far as possible against a shock, they may be covered with layers of short pieces of wood placed obliquely, and they can be protected by tarred paper from water filtering through the earth, in the same way as sod roofs are protected. Double T-Iron.-The section generally used for the long baulks of P" 13' railway carriages has 234 millimetres height, 90 millimetres breadth, U (of flange), and-13 millimetres thickness of metal; therefore i = 328' c.m., and U = 5041 c.m., and therefore when the supports rest one on another, P = 9 c.m. X 2385-5 = 21470 kilogrammes. ' This 3000 is the resistance pf the iron in kilogrammes per square centimetre.--T. B. C. 1' This necessity appears to invalidate all the previous calculation for these rails.---'I'. B. C. Therefore 21470 x I: 2 x 3000 X 328: 1,968,000, and I = 91'7. For another width 1, and disthnce apart of iron b, both being measured in centimetres, -9-= 2 layers one on another. 4'34 For the weight of 1 metre breadth, and 2 layers one on the other: These dimensions are so large that it is almost impossible to use them in practice on account of the cost. In gun casemates acting as traverses, as they have hitherto been made, the part of the wall above the embrasure (increased by the arch of the covering) is exposed to fire. The large traverses on the capital of the terrcpleins of bastions will also suffer by the perfecting of the system of indirect fire. If their cordon be...show more

Product details

  • Paperback | 80 pages
  • 189 x 246 x 4mm | 159g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236968204
  • 9781236968203