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_i 
Fig. l.-In the present method of preparing phosphatii trea ted with an equal amount of 
sulphuric 
Fig. 2.— In the furnace method of preparing phosphoric a 
in the furnace plant, the final product is a liquid conta 
gui table for fertilizer use. 
52670—23. (Face p. 5.) 
Assuming a 90 per cent efficiency 
number of concentrated products 
