2-3/8 4.4301 66450 15.00 4-1/8 2-3/8 4 2-1/2 4.9087 73620 16.70 4-1/4 2-1/2 3-1/2 2-5/8 5.4119 81178 18.20 4-1/2 2-5/8 3-1/2 2-3/4 5.9396 89094 20.00 4-3/4 2-3/4 3-1/2 2-7/8 6.4918 97377 21.90 5 2-7/8 3 3 7.0686 106029 23.80 5-1/4 3 3 3-1/4 8.2958 124437 27.90 5-3/4 3-1/4 3 3-1/2 9.6211 144316 32.40 6 3-1/2 2-1/2

TABLE OF SAFE WORKING LOAD IN LBS., FOR HOLLOW CAST-IRON COLUMNS.

[G.L.  Vose.]

Outside             Length or height in Feet              Metal
Diameter                                                 Thickness
in inches.  6      8      10     12     15     18     20  in inches.

3    16000  14000  13000  11000   9000   7000   6000    3/8
4    30000  29000  26000  24000  22000  18000  16000    1/2
5    50000  37000  45000  42000  39000  37000  31000    5/8
6    59000  57000  55000  52000  49000  44000  41000    3/4
7   101000  99000  96000  92000  88000  81000  76000   13/16
8   131000 129000 126000 122000 118000 109000 105000    7/8
9   169000 167000 164000 160000 156000 146000 141000   1
10   210000 200000 200000 200000 190000 180000 180000   1-1/8
11   250000 250000 240000 240000 240000 230000 220000   1-1/4
12   300000 300000 290000 290000 290000 270000 270000   1-1/2
14   450000 430000 410000 380000 370000 350000 330000   1-3/4
16   520000 500000 480000 460000 440000 420000 400000   2
18   650000 630000 610000 590000 560000 520000 470000   2-1/2
20   800000 760000 740000 690009 650000 590000 540000   3

[Illustration:  Pl.  IV. with Fig. 1., Fig. 2., Fig. 3., Fig. 4.]

Transcriber’s Notes: 

DISCLAIMER:  This document should NOT be used to engineer any bridge projects!  Many typesetting errors were found, and it is possible that there are further errors in the information that were not caught.

Formulas have been provided both as ASCII and TeX following in brackets.  Bold headings are handled with equal signs before and after the bold text.  Italicised text uses the standard underlines before and after the text.  Fractions are expressed in the format:  2-1/4 means two and one quarter.

The page numbers listed below are project page numbers. 
(The original book used Roman numerals to number the pages.)

Note that the book uses the “long” ton equal to 2,240 pounds.

CORRECTIONS MADE: 

   1.  Page 8—­the formula for “d” must use a cube root, which is how it
      is shown here, but the ‘3’ to indicate a cube root is not found in
      the original document.
   2.  Page 8—­typo in word ’sectien’—­changed to ‘section’.
   3.  Page 10—­Value for working comp. strength of cast iron in the
      table had a typo