644 



SCIENCE 



[N. S. Vol. XLVII. No. 1226 



hence 



540,000 



BAXCF 



= 33.3 per cent. 



CB 



1,620,000 X 2 



or in figures. 



: 540,000 barrels, 



whicli represents the required production of 

 the milling division for a two-weeks period. 



If now the line AB is divided into 10 equal 

 parts, then AB/10 — 10 per cent. ; 2 X (^-B/ 

 10) =20 per cent.; 3 X (-^-B/IO) = 30 per 

 cent., etc., of the total expected output. From 

 the preceding it is clear that a line drawn 

 through point G, parallel to BC, (Fig. 2) which 

 intersects with the vertical line AB in H will 

 express in its total magnitude BH the amount 

 of barrels of flour manufactured up to date in 

 per cent., of the total expected production (re- 

 quirements) or: 



1,620,000 



If furthermore FG is divided into ten equal 

 parts and FG-1 is connected with AB-1, 

 and FG-2, is connected with AB-2, it is easily- 

 seen that all vertical lines between C and 

 B, for instance X — A', are also divided into 

 10 equal parts, and as the magnitude of all 

 vertical lines represents production, we can ex- 

 press the actual production in two ways : 



1. Production in percentage of total pro- 



duction or output at the end of the ex- 

 piration date (in our case February 9, 

 1918), 

 or 



2. Production in percentage of the total 



production up to any period between the 

 start of production and the expiration 

 date. 



