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sweep and mop a section of floor. Then, as soon as it dries, without a single foot ever having been set upon it. whisk over it with a treated dry mop. Invariably, the mop will be literally black with resettled dust, fine particles, and "invisible** dirt from the so-called sparkling clean floor!
Three impressive advantages are offered by the new system: ll increased cleanliness and better appearance; 2l time and labor saving; 3) keeping dust from resettling where it may become a health or sanitation hazard.
A headache
In the projection room, this "resettling" of dust when conventional cleaning methods are used can be a real headache. When dust is "removed" from the floor by conventional methods, and resettles on projection or other equipment, you're really worse off than when you started!
Broom sweeping and wet-mopping involve two separate, time-consuming operations. The dry-mop operation is a single step.
The new dust control method carries a special "bonus": effective germicidal control. Results of hundreds of laboratory tests conducted l>\ Prof. Martha Sager at the biology department of The American Universitv have indicated that treated mops provide substantial anti-microbial activity and reduce the hazards of transmission usually encountered when untreated mops and dust cloths are used by maintenance people.
Prof. Sager reports: "Each of the germicides commonly added to treated drv mops i phenols, mercuric compounds, and quaternary ammonium compounds I affects the bacterial cell in a different manner, so each is effective in destroying the organism or its ability to reproduce."
Let your screen show everything that's on the film
What is adaptable to the hospital and other businesses may well be adaptable to the projection room. Chemically-treated cloths are quite capable of removing carbon dust and other dust more easily and efficiently than anything yet devised.
Incidentally, if any reader of International Projectionist would like to have a copy of Professor Sager's report, it is available free upon request by writing: The Dust Control Information Bureau, Executive Building. 7100 Baltimore Ave.. College Park. Md. iP
International Projectionist April, 1965
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Pioneers and leaders in optical design and manufacture for
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