SYMBOLIC NOMENCLATURE. 107 



NOTE. The line between members and components is necessarily an uncertain one 

 and depends greatly upon the nature and number of the parts classified; convenience 

 also enters. The difference is mainly that of complexity of function. Vet, a 

 ramrod may be either a piece, a member or a component, according to the way it is 

 regarded. In such cases it would be best to use the name highest on the scale, as it 

 will give room for future additions. For example, page 120, the breech screw is named 

 B. 30, although it is a single piece; this is done so that if this part should ever become 

 composite, there would be room from 21 to 30 for the designation of each of its pieces, 

 the component number remaining unchanged. 



Notation. 



I-. When the Shop-Order number is not sufficiently explicit, the 

 staple is designated by as many descriptive letters, not exceeding 

 three, as may be required for the purpose. 



Of these three letters the last one tells the particular class of 

 staple referred to, and the first two define the pattern of that class. 



Thus, among arms, S-F-R. means Spring-Field Rifle ; S-N-R. 

 Spe-Ncer Rifle ; H-K-R. Hotch-Kiss Rifle ; H-K-C. Hotch-Kiss 

 Carbine, etc. R. and C. give the class, and the other letters the 

 patterns. 



For cartridge making, B. means ball, and O. blank, the two main 

 classes of cartridges. F-R-B. means Folded-head-Rifle-Ball (car- 

 tridge understood); S-C-O. Solid-head-Carbine-Blank, etc. 



These descriptive letters correspond to Mr. Oberlin Smith's 

 machine symbols, page 116. 



2. The member symbol is a letter; for examples of this and 

 following cases, see lists hereafter. 



3. The component symbol is a number ending in O., following 

 the member letter, thus: A. 20; B. 30; A. 130. 



4. The piece symbol is a digital number following the letter of 

 the member to which the piece belongs, thus : A. I ; A. 2 ; A. 

 3; A. 14; A. 29, etc. 



Remarks. 



I. Related pieces are given consecutive numbers, forming 

 groups, the summation of which into components is indicated by 

 the next higher multiple of ten. Vacancies in the digital scale 

 are left open for expansion. Thus, pieces I, 2, 3, etc., are com- 

 bined into the component 10. The pieces for the next component 

 are numbered from 1 1 up, and the next component is 20, and so on. 



