Excerpt from Library Economics
Many varieties of card charging systems are in existence, the application of which varies in different localities. Some libraries use an indicator for fiction and cards for other classes, while others adopt card charging for all classes.
The fundamental principle of the system is that each book or work shall be represented by a movable card, kept either in numerical sequence in trays, or in pockets in the books themselves, when the books are not on loan. When the books are issued the book*cards are withdrawn from their position and placed in separate trays behind dale and other guides, either by themselves or in conjunction with the borrowers' cards according to the practice in vogue at the library. Some libraries adopt the system of retaining the borrower's card when he has a book in his possession, others allow him to keep his card at ail times.
The practice to be described is where the borrowers' cards are retained. The difference in procedure where the opposite obtains will be obvious.
The card charging system most in vogue in open access libraries is what may be called the loose pocket principle.
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