268 



PROPOSED SYSTEM. 



and take much less time to prepare than any complete tables of 

 figures. To find the value of labor, say at $2.75 per day of 8 

 hours, for 3 days 7^ hours, all that is necessary is to look 

 out the given time in the lower line and follow up the correspond- 

 ing vertical until it intersects the 2.75 line ; the horizontal passing 

 through the intersection gives the amount of wages with an error 

 due only to mechanical inaccuracies in ruling. 



The table shown is intended only as a general illustration of a 

 principle to be applied for each case as circumstances may re- 

 quire. At Benicia Arsenal the following scales were found con- 

 venient: The paper was in each case about 18x23 inches, bought 

 ruled in tenths of inches in pale blue. This ruling was overlaid 

 by dark blue and red lines as indicated below. The general idea 

 prompting the use of different scales was, that short jobs would 

 generally be those requiring the most exact account. 



Suggested Scales for Wages Tables. 



