Class Index Entry
Class Index Entries direct the user to the Classified Part of the catalogue where materials on different subjects are arranged in a filiatory sequence with an indication of the relevant Class Number. The Class Index Entries are derived from the Class Number through the 'Chain Procedure' method.
For example, for the Classified Catalogue Code by Ranganathan Class Index Entries are provided thus:
CLASSIFIED CATALOGUE CODE 2:55 N3
CLASSIFIED CATALOGUE 2:55
CATALOGUE, LIBRARY SCIENCE 2:5
LIBRARY SCIENCE 2
All Class Index Entries carry the statement "For documents* in this Class and its Sub-divisions, see the Classified Part of the catalogue under the Class Number". (* Earlier the word "books" was used but the word "documents" is relevant now).
Look at the entry given below for one of the above subjects.
Similar entries are given for the other subjects stated above. These entries are General Added Entries and they are filed in the Alphabetical Part of the Classified Catalogue. You might have noticed that they are similar to the Subject Added Entries in the Dictionary Catalogue. In the Dictionary Catalogue details of document that is being catalogued are given in the entry. But a Class Index Entry indicates the Class Number under which documents on a particular subject are classed.