Column 7 the thickness of washers.
Column 8 breadth (side to side) six-sided nut.
Column 9 breadth (across angles) six-sided nut.
Column 10 thickness of six-sided nut.
Column 11 number of screw threads per inch.
Column 12 gives the diameter of rod.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Diameter. | Strength of Rod. | Weight per Foot. | Square Nut. | Thickness. | Square of Washer. | Thickness of Washer. | Six-Sided Nut. | Six-Sided Nut. | Six-Sided Nut. | Screw. | Diameter. |
| ½ | 2,940 | 0.66 | 1¼ | ¾ | 2½ | ¼ | 1⅜ | 1½ | 9 16 | 12 | ½ |
| ¾ | 6,630 | 1.49 | 1½ | ⅞ | 3 | ¼ | 1¾ | 2 | ⅞ | 10 | ¾ |
| 1 | 11,775 | 2.65 | 2 | 1 | 4 | ⅜ | 1⅞ | 2¼ | 1⅛ | 8 | 1 |
| 1⅛ | 14,910 | 3.36 | 2 | 1⅛ | 4½ | ⅜ | 2⅛ | 27 16 | 1¼ | 7 | 1⅛ |
| 1¼ | 18,405 | 4.17 | 2¼ | 1¼ | 5 | ½ | 2¼ | 211 16 | 17 12 | 7 | 1¼ |
| 1⅜ | 22,260 | 5.02 | 2½ | 1⅜ | 5½ | ½ | 2½ | 2⅞ | 17 16 | 6 | 1⅜ |
| 1½ | 26,505 | 5.97 | 2¾ | 1½ | 6 | ½ | 2⅝ | 3⅛ | 111 16 | 6 | 1½ |
| 1⅝ | 31,095 | 7.01 | 2⅞ | 1⅝ | 6½ | ⅝ | 2⅞ | 35 16 | 113 16 | 5 | 1⅝ |
| 1¾ | 36,075 | 8.13 | 3 | 1¾ | 7 | ⅝ | 3 | 3½ | 2 | 5 | 1¾ |
| 1⅞ | 41,415 | 9.33 | 3¼ | 1⅞ | 7½ | ⅝ | 3¼ | 3¾ | 2⅛ | 4½ | 1⅞ |
| 2 | 47,130 | 10.62 | 3½ | 1⅞ | 8 | ⅝ | 3½ | 4 | 2¼ | 4½ | 2 |
| 2⅛ | 53,190 | 12.00 | 3¾ | 2 | 8½ | ¾ | 3⅝ | 43 16 | 2⅜ | 4 | 2⅛ |
| 2¼ | 59,640 | 13.40 | 4 | 2⅛ | 9 | ¾ | 3¾ | 46 16 | 2½ | 4 | 2¼ |
| 2⅜ | 66,450 | 15.00 | 4⅛ | 2¼ | 9½ | ¾ | 4 | 4⅝ | 2⅝ | 4 | 2⅜ |
| 2½ | 73,620 | 16.70 | 4¼ | 2½ | 10 | ¾ | 4¼ | 4⅞ | 2¾ | 3½ | 2½ |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
179. Let us now assume the following data:—
| Span | 200 | feet, |
| Rise (centre to centre of chords) | 25 | feet, |
| Width | 20 | feet, |
| Length of panel | 15 | feet, |
| Weight (bridge and load) per lineal ft. | 4,000 | lbs. |