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

[G.L. Vose.]

Outside DiameterLength or height in FeetMetal Thickness
in inches.681012151820in inches.
316000140001300011000900070006000⅜
430000290002600024000220001800016000½
550000370004500042000390003700031000⅝
659000570005500052000490004400041000¾
710100099000960009200088000810007600013/16
8131000 129000 126000 122000 118000 109000 105000⅞
9169000 167000 164000 160000 156000 146000 1410001
10210000 200000 200000 200000 190000 180000 1800001⅛
11250000 250000 240000 240000 240000 230000 2200001¼
12300000 300000 290000 290000 290000 270000 2700001½
14450000 430000 410000 380000 370000 350000 3300001¾
16520000 500000 480000 460000 440000 420000 4000002
18650000 630000 610000 590000 560000 520000 4700002½
20800000 760000 740000 690009 650000 590000 5400003

TRANSCRIBER'S NOTES:
DISCLAIMER: This document should NOT be used to engineer any bridge projects!
It is possible that there are further errors in the information that were not caught.
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 (25,v00).
Since other values use round numbers, it is assumed the value should be 25,000.
4. Page 10 - Two other typos. Changed 'the the' to 'the', and in table heading, original
word was 'detrution', changed to correct spelling of 'detrusion'.
5. Page 12 - changed 'woooden' to 'wooden'.
6. Page 13 - Example II - In the calculations, the intermediate value in the book was
printed as the square root of 67.2. The left part is correct, but reduces to the square root
of 268.8, and that is ~16.395. So I have corrected the intermediate value.
7. Page 13 - Because the original page scan cut off the text on the right edge, I have
made assumptions on what text was missing. Because the scans came from an
outside source, I could not get the missing information, which was the words at the
end of Example II, and words in the last paragraph of the page.
8. Page 14 - Three typos found: 'dimensiens' for 'dimensions', 'betng' for 'being',
and 'ars' for 'are'.
9. Page 17 - a value in a formula was printed as 6000, but in the context of the other
information, particularly the example immediately following, the value was believed
to be incorrect, and was changed to 5000.
10. Page 23 - The value of 388 sq. inches at the top of the page in the book is incorrect;
3 x 8 x 12 = 288, so has been corrected.
11. Page 24 - Rods section, numerical value appeared to be 15.000 in book, but from
context, must be 15,000 instead.
12. Page 28 - Typos: changed 'Trautwine's Edgineer's Pocket-Bood' to Trautwine's
Engineer's Pocket-Book'; corrected 'af' to 'as', 'bracas' to 'braces'.
13. Page 30 - Apparent typo in the table at the bottom of page. Value for Center Brace
size for 200' span was shown as '8 x 1', believed from context of table to be '8 x 10'.
14. Page 33 - table of dimensions of a Pratt Truss, last column, row starting with 150,
the original says 8--1-1/8, this is believed to be, and has been changed to, 3--1-1/8.
15. Page 37 - The five formulas with square roots were incorrectly printed in the book,
multiplying the terms inside the square root instead of adding them, which is obviously
incorrect per the Pythagorean theorem of right triangles.
16. Page 38: The fifth ratio in the group of five near the top of the page must start with 20,
not 10 as in the book
17. Page 38 - The equation for W as printed on this page is not consistent with that
found on pages 18 to 24, so has been corrected from 'bd^2' to 'bd^3'.
18. Page 39 - arch brace truss table heading typo - changed 'FOE' to 'FOR'.