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imum. They also have their disadvantages, the least of which is the smallness of the picture they project. This picture size, while entirely adequate for home use, is not quite suitable for school, church, or auditorium use if the amateur hopes to go in for that work. The 8mm. film has a single row of perforations on the side of the film. The 9%mm. has a single perforation in the centre of the film and at the base of each frame. Difficulties are sometimes encountered when perforations are broken. Nev- ertheless, the 8mm. field is attracting a large number of ama- teurs because of its economy. The 16mm. film on the other hand, with its two rows of perforations, can still be serviceable if some of the perfora- tions are broken on one side. COMPARISON OF FILM SIZES—A glance at the frontis- piece will show the size of each of the three most popular widths of film available to the amateur. His choice of the width he prefers to work in rests entirely with him, depending upon the amount of money he wishes to expend for his equip- ment. Roughly, the advantages and disadvantages of the four widths of film based on the standard running time of 16 min- utes per reel, may be summarized thusly: 35mm., or standard theatre size, costs about $30 per thous- and feet of negative. Developing the negative costs another $15 or $20. A positive print for projection costs another $30. Therefore, a minimum cost of $75 or $80 per reel of 1,000 feet of projection film must be counted in this field. Four hundred feet of 16mm. film which runs just as long as the 1,000 feet of 35mm. film, on the other hand, costs only $12 to $20, de- pending upon the quality of film desired. When you add the cost of the large reel and humidor can necessary to store the 35mm. film, it is readily seen why this width is beyond the average amateur’s purse. An investment in 2,000 feet of film must be made to ob- tain 1,000 feet of projection film. This film is inflammable and cannot be unprotected during projection as can the amateur 9