This document discusses different types of devices used in colon classification schemes. It describes chronological devices which use dates, geographical devices which use locations, mnemonic devices which use numbers to aid memory, alphabetical devices which use initial letters, subject devices which assign classes in brackets, superimposition devices which use hyphens to combine facets, and classic devices which use colons to group different editions of classics. Examples are provided for each type of device to illustrate their notation and application in classification.

1. By
Pritee Sharma
Assistant Professor ( A.C.)
School of Library & Information Science
Devices in Colon Classification
(C.C.)

2. What are the Devices
 Devices in library classification as components used
for forming or sharpening a facet in an analytico-
synthetic classification scheme. Based on the
characteristic used for this purpose, they are called
chronological devices, geographical devices, etc.
These devices are used by classification systems
wherever helpful and possible and are applicable in all
three planes the idea plane verbal plane a the
notational plane.

3. Types
Chronological Device
Geographical Device
Mnemonic Device
Alphabetical Device
Subject Device
Super Imposition Device
Classic Device

4. Chronological Device
 This devices used for epoch of origin (Date of origin),
or birth, on the year of 1st investigation or discovery
etc.
 Examples:1. Dewey Decimal Classification: 2:51 M76
 2. Godan by Premchand,autor born on 1880 his 13th
works. : O152, 3M80 ,25
 3. Colon Classification Scheme: 2:51N3

5. Geographical Device
 The Geographical devices (GD) consist in using the
appropriate characteristic as country , state , district,
continent etc.
 Examples:
 1. Indian Law : Z44
 2. Indian History : V44
 3. Indian Philosophy : R44
 4. Law of England : Z 561

6. Alphabetical Device
 The alphabetical Devices (AD) consist in using the
first or the first two or the first Three etc.
 Examples:
 1. Bashmati Rice Plant : J381 B
 2. Shakespear’s Hemlet : O1112J64,H
 3. Dushari Mango Plant : J3751D
 4. Creta Car : D5133 CRE

7. Subject Device
 The subject devices consist in using the appropriate class
(subject) for the of an isolate, or two main classes are
given and it is idenoted by ()Circular brackets.
 Examples:
 1. Hindu Law : Z(Q)
 2. Agriculture Library : 2 4(J)
 3. Religiou Library : 2 4 (Q)
 4. Medical Library : 24 (L)

8. Superimposition Device
 When an isolate is not scheduled in facet but can be regarded as
the mutual denudation Of two of the scheduled isolate it is called
super-imposition devices. it is denoted by '-' Hyphen.
 Examples:
 1. Bones of Head : L18-82
 2. Arteries of eyes of the man : L185-37
 3. Hair of Heads of Female : L9f, 18-881
 4. Urban Youth: : Y12-33
 5. Working Class women : Y 15-49

9. Mnemonic Device
 Means add to memory or easy to learn.
 Examples:
 God,world,Unity, one dimension, or line solid state used as mnemonic Digit 1
 Digit 2: is used as mnemonic for two dimensions, plane, conics form structure
etc.
 Digit 3 used as mnemonic for three dimensions, plane, conics form structure
etc.
 Digit 4: used as mnemonic for heat, pathology, disease, transport, synthesis
etc. dimensions,
 Digit5: used as mnemonic for energy , light, radiation, organic, liquid, water,
foreign land pathology, de transport, synthesis, etc. dimensions,
 Digit 8: used as mnemonic for Travel, organization, fitness

10. Classic Device
 “A book stimulating other books and literature on itself is a
classis”
 This devices used for classical books basically related to
some special classes like Sacred books of Religion,
Literature, Sociology etc.
 The Classic Device (CID) is employed for bringing together
the different editons of a classic in a class. It is represented by
:g
 Example: Geeta Saar with Mahabharat, or Ramayan with its
slokes , Godan with its criticism