MILK-PLAXT OPERATION, 



21 



of bottles washed per man-hour was 1,044, 342, and 199 for the three 

 methods, respectively. These nimibers were not greatly different 

 from those given in Table 7, upon which the costs in Figure 15 were 

 based. The cost of labor at the plants where the data were obtained 

 was approximately 20 cents an hour in 1914. At that time the aver- 

 age purchase price of the macliines used in the plants was approxi- 

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JOOO 2000 3000 4000 5000 6000 7000 3000 9000 /OOOO 



Fig. 15.— Comparative costs for labor and for interest and depreciation on equipment, with tliree 

 methods of washing bottles, based on labor requirements at 113 plants. ( Trices or 1921.) 



mately SI, 500 for the automatic machines and $175 for the brush wash- 

 ers. The lines representing the automatic and the brush-wixshing types 

 intersect at about 2,300 bottles, indicating that when this number of 

 bottles was reached it would have paid a dealer to consider the economy 

 of changing from an ordinary brush washer to the automatic machine. 

 By comparing Figures 15 and 16 it is apparent that even thoudi 

 equipment is much more expensive now (1922) than in 1914, the 



