TABLE 417.— TABULAR COMPARISON OF WIRE GAGES 405 



The American wire gage sizes have been rounded off to the usual limits of commercial accuracy. 



They are given to four significant figures in Tables 420 to 423. They can be calculated with any 



desired accuracy, being based upon a simple mathematical law. The diameter of No. 0000 is defined as 



0.4600 inch and of No. 36 as 0.0050 inch. The ratio of any diameter to the diameter of the next 



39 / 



greater number \ li^°_^=r 1.1229322. 

 \ .0050 

 t The steel wire gage is the same gage that has been known by the various names: "Washburn and 

 Moen," "Roebling," "American Steel and Wire Co.'s." Its abbreviation should be written "Stl. W. G." 

 to distinguish it from "S. W. G.," the usual abbreviation for the (British) Standard Wire Gage. 



(continued) 



SMITHSONIAN PHYSICAL TABLES 



