The Educational screen (c1922-c1956])

April, 1945 Page 161 In the Versatol, this exclusive, patented inner-locking design assures automatic locking of the square elevating rod at the correct picture dimension. Inner spring (A) and notched rod (B) eliminate external locking devices. Only DA-LITE Screens Have This Positive Automatic LOCKING FEATURE It assures correct picture proportions It eliminates separate adjustments of case and screen fabric It prevents ripping fabric from roller Da-L!fe tripod screens — the famous Challenger and the popular-priced Versatol illustrated here — are the only portable screens that offer automatic locking at the correct picture proportions, (without separate adjustments of the fabric or the case.) Other improvements include: rigid design that holds case and top slat in perfect alignment assuring a wrinkle-free picture surface; self-adjusting tripod legs; easy adjustment of height; and the same fine plastic-coated glassbeaded fabric as is used in the highest priced Da-Lite models. For convenience and lasting satisfaction, ask your visual education dealer for DA-LITE Screens. Write for literature! In the Versofo/, case bracket (A) is securely clamped in fixed position to tubing (B) which is raised or lowered to adfust the height. I I OME -scrs^ Ree. U. S. Pat. Off.) DA -LITE SCREEN COMPANY, INC. Dept. 4ES 2723 No. Crawford Ave., Chicago 39, III. these differences between the schools were (a) differences in age from school to school, (b) differences in I. Q. from school to school, (c) differences in picture study instruction within each school, (d) differences in the socio-economic status (home environment) of children within each school. 9. In general, where the subject matter of tlie paintings was portraiture, the traditional painting in the pair tended to be preferred more than the modern painting. Where the subject matter was landscape, the modern painting in the pair tended to be preferred to the traditional painting. 10. In general, girls preferred the traditional painting more than boys did, where the subject matter was portraiture, while boys preferred the traditional painting more than girls did, where the subject matter was landscapes. QUESTION BOX ON FILM PRODUCTION QUESTION: Please describe any or all the possible methods one could employ to eliminate the annoyance as well as the embarrassment caused by film breaks during public screening. ANSWER: The first thing to do with any film that is to be projected before an audience is to preview it. Any weakspot or complete break will show up in time to avoid the embarrassment you speak of. If the film is too long to be ))revie\\ed. a tjuicker method of insi)ection could be made by running the film on the rewind machine. During this process it is a good idea to keep the edges of the film between the thumb and index finger. Broken or torn sprockets can thus be discovered in time and mended. If your own splices come apart, they may be due to many causes. The splices or any part of the film itself may become vbrittle ;ukI break, if the film is kept in too warm or too dry an atmosphere, a change in climate to a cooler spot in the room may restore the film to a healthy condition. The splicing fluid may liave become too thick. This is due to evaporation which takes place every time the cover is removed from the bottle. This change in the viscosity of the fluid renders it less effective as a binding material. I suggest that you use the smallest size bottle for your film cement, thereby removing the opportunity for this liquid to reach the dangerous old age. In preparing the film for spicing be sure to remove the entire emulsion from that part of the film which is to be covered with cement. The smallest bit of emulsion left on the film base will prevent the perfect welding together of the two parts. Before applying the film cement be sure that the film base has been thoroughly dried. Water will weaken the s|)licing fluid, and sfX)ner or later will cause the splice to come apart. If there is a film tension control on your projector if pays to become its friend and learn exactly the amount it will stand before it gets temperamental and starts to chew and maul the film. Proper lengths of film loops while threading the machine also keeps the projector in good humor. In spite of alt these precautions "gremlins" still find a way of sneaking into a film performance, and playing havoc with the projectionist's nerves. To reduce the time lost during these unfortunate interruptions it is worth investing in a second pick up reel and to keep it on hand during public performances. Should a break occur, the broken end of film from the supi)ly reel can easily be attached to this second pick up reel in less time than it takes to make a splice. If a second pick up reel is not available a piece of scotch tape or a narrow strip of gunmied pai)er can be used to make a speedy, temporary splice. DAVID SCHNEIDER Evander Childs High School, New York City