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41.
NOTES ON THE SAFEGUARDING AND CONSERVING CULTURAL MATERIAL IN THE FIELD

VII. [[underlined]]"OPTIMUM CONDITIONS FOR MONUMENTS AND MATERIALS[[/underlined]]
When monuments and other material are under adequate guard; when precautions have been taken against immediate damage or disintegration; and when the location of movable objects has been settled, the next step is to establish the best environment possible for the physical welfare of the monuments, etc., in question. This has [[?]] two aspects;
(i) Deciding what is best for any particular type of material.
Specific information on this is given in Part II, in the sections dealing with each type.
(ii) Getting it done, and obtaining help.
This is a matter for your own ingenuity, and of enlisting the services of specialists in various branches of the service.
[[underlined]]General rules[[/underlined]], which always apply are:
1. [[underlined]]Extremes of heat and cold[[/underlined]] are to be avoided, though either is less dangerous than rapid changes from one to the other. Therefore
(i) Don't allow heating in a building to be suddenly turned on or off
(ii) Don't allow sudden rushes of hot or cold air into a building.  The temptation to air stuffy rooms quickly should be resisted; stale air won't hurt cultural material.
(iii) If ventilating fans are used, don't have