Abstract
In localities in which there is a large amount of dust in the air, a protective covering for such instruments as the microscope, colorimeter and microtome becomes a necessity. The usual glass bell jar is heavy, awkward, expensive and easily broken. It is in the hope that others will find it advantageous to use that a description of a cover I have devised is presented in the accompanying illustrations. Discarded noninflammable roentgenograms are placed in warm solution of sodium bicarbonate and the photosensitive film is removed, care being taken not to scratch the base. Accurate measurements of the proposed covers are made and a design worked out on paper, so as to utilize the size of film on hand and to make as few joints as possible. The film is ruled with a glass marking pencil and cut to size. At the joints it is necessary to provide for a
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