PROPERTIES OF STRUCTURAL METALS. 



47 



rejection, provided not more than one-third of the total number of bars 

 tested break in the head ; otherwise the entire lot will be rejected. 



15. Variation in Weight. The variation in cross-section or weight 

 of more than i\ per cent, from that specified will be sufficient cause for 

 rejection, except in the case of sheared plates, which will be covered by 

 the following permissible variations: 



(a) Plates 12 J pounds or heavier, when ordered to weight, shall not 

 average more variation than 2^ per cent, either above or below the 

 theoretical weight. 



(b) Plates from 10 to 12^ pounds, when ordered to weight, shall not 

 average a greater variation than the following : 



Up to 75 inches wide, 2^ per cent., either above or below the theoret- 

 ical weight. 



Seventy-five inches and over, 5 per cent., either above or below the 

 theoretical weight. 



(c) For all plates ordered to gauge there will be permitted an average 

 excess of weight over than corresponding to the dimensions in the order 

 equal in amount to that specified in the following table. 



TABLE OF ALLOWANCES FOR OVERWEIGHT FOR RECTANGULAR PLATES 

 WHEN ORDERED TO GAUGE. 



Work of International Association. An effort is being 

 made at this time by the International Association for Test- 

 ing Materials, to establish international standard specifica- 

 tions for the inspection of iron and steel. Each national 

 branch will contribute to the grand council a committee 

 report, dealing in part with "Determination of Methods of 

 Testing the Homogeneity of Iron and Steel, looking to their 

 Eventual Use for Inspection," and from these reports a new 



