987 ENGINEERING WORKS , ETC . ribs between them at equal distances apart , braced with diagonal bents iO } 4 inches deep , and consist of angle iron carried at every 18 feet 6 inches by trussed purlins between the ribs ; they are con - … Fig . 694 . — St . Pancras Station Roof of Midland Railway , London . structed so as to stiffen the main ribs laterally . The bracing is so arranged to carry the proper portion of the three intermediate ribs , and to keep the main ribs in their proper position . The main ribs are tied underneath…
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