Most workers have experienced difficulty at times in producing accurate drawings of microscopic slide images; consequently a number of drawing aids have been invented, none of them entirely successful. The camera lucida, for example, is difficult to use effectively because of the delicate balance necessary between light in the microscope and light on the drawing surface. Also, with this instrument and the many slide projectors, the pencil and hand intercept the projected image. Furthermore with conventional drawing aids, it is difficult to make direct drawings to the scale required for reproduction. It was therefore considered worth while to report on a simple device which appears to overcome these difficulties.