CHAPTER II. 
SECTIONS OF IRON. 
The larger part of the data contained in this chapter was obtained through the 
courtesy of Jas. Forrest, Esq, C. E, Secretary of the Institution of Civil Engineers, 
London, who very kindly complied with tlie author’s request to collect for him books 
of sections and tabulated dimensions of all tlie bridge iron used in Great Britain. 
Messrs Carnegie Bros, and Co. of Pittsburgh Pa. have been so kind as to furnish 
most of the remaining data. 
Although this collection of sections of bridge iron is not complete, yet it contains 
tlie dimensions of nearly all tlio sections used in Great Britain and America. 
Owing to want of dimensions tlie shapes rolled by tlie following British manu- 
facturers have not boon recorded ; W™ . Wliitwell and Co, Stockton-on-Tees ; Jos. 
Whitman and Sons, Perseverance Ironworks, Leeds ; Dorman, Long and Co, Middles- 
brough ; and tlie {Skerne Ironworks Company, Darlington ; but j udging by the illustra- 
tions in Mr. Edward Hutchison's u Girder- Making and the practice of Bridge Build- 
ing in Wrought Iron ” one may conclude that these firms roll no shapes very different 
from those here recorded. 
In America there are other manufacturers than the three here given, but these 
three roll most of the bridge iron used in that country. 
Tlie tables of sections have been made as complete as the data at tlie author’s 
disposal would allow, so if any manufacturer’s produce has been slighted or that of 
any other received undue prominence, it is to be hoped tliafc the author will be 
pardoned. 
