| ECONOMICS OF SUSPENSION BRIDGES | 277 |
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solve several examples based on current unit prices of the materials in place. These may be taken as follows: |
| Wire cables | 23 ¢ per lb. |
| Mayarí steel | 10 ¢ " |
| Commercial nickel steel | 11 ¢ " |
| High-grade nickel steel | 12 ¢ " |
| Concrete in pier shafts and anchorages | $16.00 per cu. yd. |
| Mass of pneumatic bases | $35.00 " " |
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In pitting the eye-bar cables of the various alloy-steels against wire cables it will suffice for three spans, viz., those of 1,000, 2,000, and |
