USEFUL ARTS 
669 Metallurgy and assaying 
History of metals goes here, not in 553, 622, nor 671 
Iron and steel 
Gold and silver 
Copper 
Led 
Zinc 
Tin 
Mercury and other metals 
Fuels and furnaces Slags 
Assaying 
Manufactures 
— 
Specific topics go where of most interest. These heds ar for the general subject of metal, 
wood, etc. manufactures, and for such specific manufactures as ar not of more interest 
elsewhere. But an account of a specific manufacture is commonly most useful with its 
own subject; e. g. a steam engin is certainly made of metal, but {ts manufacture should 
go under 621.1, not 672. The caracter of the library often decides the place of greatest 
interest. An agricultural library would prefer the manufacture and everything about 
wood churns with the dairy, 637, while a manufacturing library might prefer it with 
other wood manufactures in 674. A general library wil incline to the special subject, 
as a more minute classification is thus obtaind, and references under 670 anser inquiries 
for all the library has on the subject of bras or rubber or paper manufactures. Whether 
groupt by use or material, if sought from the other standpoint, the references show the 
resources promptly. As a rule the use is the better classification, being more minute 
and oftener wanted. But if the uses ar various the general hed is better; e. g. bels 
ar for scores of distinct uses. but their manufacture is a unit; but all churns ar for 
the dairy 
Articles made of metals 
Of iron and steel; stoves, cutlery, etc. 
Of copper and of bras, bronze and other industrial copper alloys 
Bels etc. See also 739 
Lumber and articles made of wood 
For cabinet making see 684. For lumbering as a feature of forestry see 634.9 
Lether and fur and articles made of them 
For saddlery, shoemaking, gloves, belts, trunks etc. see 685 
Paper and articles made of paper 
671 
672 
673 
674 
675 
676