CAMBRIA STEEL. VII 



shown approximately on page 26. For beams and channels the 

 increase from the minimum adds equally to the web thickness and 

 flange width, the weight of the increase being equal to that of a 

 plate of the same depth as the section, and of a thickness equal 

 to the increase of the dimensions stated. 



The method of increasing the thickness of angles from the mini- 

 mum has the effect of adding to the length of the legs, as shown 

 on page 26, so that for intermediate and maximum sizes the legs 

 will be somewhat longer than the minimum or nominal dimen- 

 sions, except in the cases for which we have finishing grooves. 

 The plates of drawings of sections, pages 2 to 26 inclusive, show 

 the minimum or base sizes of the various shapes, except in cases 

 of standard ship channels and bulb angles as heretofore noted. 

 Sections shown on the plates or lists for which more than one 

 weight is stated can be rolled of different thicknesses to produce 

 the stated weights. Others for which only one weight is given 

 cannot be varied. Each section shown herein is numbered, both 

 in the plates and tables, for convenience in reference and ordering. 



I-Beams and Channels should be ordered of weights shown in 

 the tables. Orders and inquiries concerning 12 in. 40 lb., 15 in. 

 60 lb., and 15 in. 80 lb. I-Beams should also specify these by 

 Section Number. 



Orders for angles and plates should specify either the thickness 

 or the weight, but not both. 



Orders for universal or edged plates should specify the width 

 and thickness in inches and the length in feet and inches, whereas 

 orders for sheared plates should give all the dimensions in inches. 



All weights are stated in pounds per lineal foot of section, except 

 in the table of rails on page 214, in which the weights are given in 

 pounds per yard, as is customary. Weights of rolled sections are 

 calculated on the basis of 489.6 pounds per cubic foot of steel, and 

 3.4 times the sectional area in square inches equals the weight in 

 pounds per lineal foot. In calculating the weights, areas, and prop- 

 erties of I-Beams, Channels, and Angles for the lists and tables here- 

 with, the fillets and smaller rounded corners were not considered. 



The dimensions of all steel material herein are theoretical, as 

 they are subject to customary rolling variations. 



Structural Angles, I-Beams and Channels, unless otherwise 

 ordered, will be cut to length with variation not to exceed f inch 

 more or less than that specified. For cutting to exact lengths, 

 or with less variation than f inch, an extra price will be charged. 



All sections shown herein are steel. 



