INDUSTRIAL STATISTICS. 411 



For heating iron or steel, capacity of each furnace from 20 to 



GO tons per 24 hours 8(3 furnaces. 



For melting steel on the open hearth 21 " 



For melting steel in crucibles (each furnace of 24 or 30 pots 



capacity) 3-4 " 



The total capacity of the Siemens crucible steel-melting 

 furnaces is 828 pots per heat, representing an annual pro- 

 ductive capacity of 33,000 tons in 250 working days. The 

 following are new furnaces erected during the year 187V: 



Open-hearth 4 furnaces. 



Crucible steel-melting 2 " 



Heating, iron or steel 13 



a 



Besides the above, the furnace, during the year 1817, has 

 been introduced with excellent results for the manufacture 

 of Q-lass and the smeltincj of zinc ores. 



We add to the above the following estimate of produc- 

 tion for the year 1877 (furnished by Messrs. Richmond and 

 Potts) : 



By Siemens's crucible steel-melting furnaces (net tons) 31 ,920 

 open-hearth furnaces (net tons) 42,1G8 



a n 



THE PRODUCT OF THE FORGES AND BLOOMERIES 



For the year 1876 is placed at 44,628 net tons, as compared 

 with 49,243 tons during 1875. 



GENERAL ANALYSIS OF TOTAL IRON AND STEEL PRO- 

 DUCTION. 



The following table carries the figures presented in our 

 last Annual Becord to January 1, 1877. It is an analytical 

 statement of production, in net tons, of the several branches 

 of iron and steel industries, and affords a comprehensive 

 view of the condition of the several branches of the iron 

 trade for a series of years, as derived from the statistical re- 

 ports of the American Iron and Steel Association, and which 

 may therefore be regarded as approximating as nearly to 

 the truth as it is possible to attain in a review of allied in- 

 dustries of such magnitude. 



The most noticeable feature of this table, it will be ob- 

 served, is the enormous increase of the figures referring to 



