126 PROPOSED SYSTEM. 



In fine, we must always use the Shop-Order number and the 

 member symbol with its numerical suffix when this is required ; to 

 these we must prefix only as many descriptive symbols as are 

 needed to thoroughly define the object in question. 



4. N. or Operation. 



Under this heading on the cards is to come the symbolic num- 

 ber of the operation requiring the expenditure which the card 

 reports. It was formerly restricted to the staple objects which 

 we have just discussed ; but by the use of more general tables, 

 to be described, it may be used for general work. 



A good system of symbolizing operations is very important, 

 for upon the exact knowledge of their comparative cost will be 

 founded the most important economical reforms. 



The system should be simple, comprehensive and flexible. 

 Simplicity can be best attained by a proper classification, 

 grouping together operations of the same class. Their symbols 

 will thus be most easily remembered, since, as a rule, the same 

 class of workmen will use the same class of symbols. Also, mis- 

 takes in notation will be of less consequence, since the errors will 

 tend to confine themselves to the limits of the group. See 

 page 43- 



Comprehensiveness is given by spacing the groups so far apart 

 that they may be extended without danger of overlapping. See 

 Mr. O. Smith's remarks on " gaps," page 1 1 1. 



Flexibility is attained by permitting a certain internal develop- 

 ment of individual symbols within a group. 



If we assume that an operation is intended to make some 

 change in the condition of the object operated on, we are forced 

 to base our classification upon the means employed to effect that 

 change, because the other variables the operators and the ob- 

 jects operated on have already been classified separately. 



In the accompanying example I have endeavored to apply 

 these principles to the wants of an Arsenal. The effort 

 amounts only to a suggestion, for every shop will need data not 



