The Useful Metals And Their Alloys: Including Mining Ventilation, Mining ...
The Useful Metals And Their Alloys: Including Mining Ventilation, Mining ...
J John Scoffern
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Ton«. Inches. Inehm. Ft. In«. 30 180 14-63 1706 2 4 35 210 1706 19-91 2 8 40 240 19-50 22-75 3 1 45 270 21-94 25-59 8 6 50 300 24-38 28-44 3 10 55 330 26-81 31-28 4 3 60 Sf^O 29-25 34-13 4 7 65 890 81-69 36-97 6 70 420 84-13 89-81 5 6 75 450 36-56 42-67 6 9 80 480 3900 45-50 6 2 85 510 41-44 48-34 6 7 90 540 43-88 61-19 6 11 96 670 46-31 MOS 7 4 100 600 48-75 M*88 7 8 110 660 53 63 e2-M 8 B 120 720 68-50 68-25 9 S ISO 780 63-38 78-94 10 140 840 68-25 79-63 10 9 160 900 7313 86*31 11 6 Digitized... by VjOOQ IC 8TRSNOTH OF THE SUIB BAILWAY BRIDGE. 463 Tabk ihowing the PrvparHom of Tubular Oirder Bridge$,from 160 to SOO feet span: — Gentane break- Sectional area Sectional area Depth of the Span. ing-weight of bridge. of bottom of of top of one girder in the middle. one girder. girder. Ft. IM. Ton*. Inches. Inches. Ft. Ins. 160 960 90-00 105-00 10 8 170 1020 95-63 111-56 11 4 180 1080 101-25 11813 12 190 1140 106-88 124-69 12 8 200 1200 112-50 131-25 13 4 210 J 260 11813 137-81 14 220 1320 123-75 144-38 14 8 230 1380 129-38 150-94 15 4 240 1440 135-00 157-50 16 250 1500 140-63 164-06 16 8 260 1560 146-25 170-C3 17 4 270 1620 151-88 17719 18 280 1680 157-50 183-75 18 8 290 1740 163-13 190-31 19 4 800 1800 168-75 196-88 20 The strength of the bridge over the Snir ifi computed as follows : The Large S^an.
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