18 BULLETIN 660, U. S. DEPARTMENT OF AGRICULTURE. 



operation "mixing" is taken from the operation code (p. 17) and 

 found to be 38. Joining the two together with a dash produces 

 the full code synibol2 7-38. The letter "C" prefixed would indicate 

 construction work, while the letter "M" would indicate a maintenance 

 operation. 



Usually no classification letter will be used, but instead the capital 

 letter "C", "M", or "E," will be shown on the recording form. If 

 it be desired to know what code symbol to use in order to indicate 

 properly the time of a man spreading bituminous material on a road 

 for maintenance purposes, the letter "M" is set down first to show 

 that the work is that of maintenance. From the class code (p. 15) 

 the number for a surface is found to be 28. Preceding this number 

 with a capital letter "M" gives M-28, which shows that maintenance 

 work has been done on a road surface. Then there is selected from 

 the operation code (p. 17) the number for spreading bitumen, 

 which is found to be 60. The code symbol for maintenance work 

 of spreading bitumen on a road surface then will be M-28-60. 



USE OF CODE IN OPERATIONS. 



In actual use the cost keeper generally would obtain his data from 

 the timekeeper, who would be charged with keeping time and costs. 

 A code for use of the timekeeper would be prepared from the class 

 and operation codes, which would have the advantage of being abbre- 

 viated and also properly arranged for the cost keeper's needs. Below 

 is shown such a code, which was used on work where costs of the 

 principal operations were desired, and also the expanded code, which 

 was used where it was desired to make a more detailed study of 

 operations for the purposes of efficiency. 



TIMEKEEPER'S CODE. 



ABBREVIATED. 

 (1) 



19-17 Grading — rou£ 



EXPANDED. 



Grade and roadside. 



]1 Shoulders': 



-56 Rolling. 



-58 Shaping. 

 19 Miscellaneous: 



-07 Clearing. 



-16 Excavating borrow. 



-17 Excavating common. 



-19 Excavating loose rock. 



-20 Excavating solid rock. 



-28 Grubbing. 



-31 Hauling. 



-35 Loading. 



