Research projects that require extensive reading of microfilms can be frustrating and exhausting, as most Renaissance scholars well know. Some scholars already know, but many do not, that an ordinary color-slide projector can easily be converted into a machine for reading microfilms at home. All that is required is the construction of a simple film-holder or frame, through which microfilm may be continuously threaded, to replace the color-slide-holder of the ordinary home projector.

The design of the frame for holding the film must be modified to fit the particular brand of projector used, but the general principles of that design would seem to be constant: a flat sleeve of some stiff material like heavy cardboard, into which have been cut ‘windows’ approximately the size of a 35 mm.