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Describe various preventive measures adopted by libraries for preservation of documents against environmental factors. |
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Answer» (i) Protection from light: save from sunlight, powerful florescent electric light. Use coloured window screen, ultraviolet filter and LED bulbs (ii) Temperature: temperature of the library should be maintained at around room temperature. 200 C-250 C. AC can be used. (iii) Humidity: relative humidity 30% to 40%. Humidifiers/dehumidifiers (iv) Ventilation: uncontrolled ventilation may disturb the temperature, relative humidity, pollution level inside library. Controlled ventilation. (v) Pollution: air and sound pollution. Library site should be less polluted, if not possible, grow trees, herbs around the library. Sound proof mechanism to reduce noise. (vi) Dust: library materials should be kept free from dust. Doors, windows, ventilator, etc, which allow passage of dust should be kept under check. (vii) Photocopier: exposing pages of books to photocopying machine. Reduce the photocopying as much as possible. |
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