The Educational screen (c1922-c1956])

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June, 1934 Page 165 SCHOOL DEPARTMENT CONDUCTED BY DR. F. DEAN McCLUSKY Director, Scarborough School, Scarborough-on-Hudson, N. Y. A Visible Record of Lantern Slides C. J. KOENIG IN A MODERN secondary school which makes ef- ficient use of visual aids, the cataloguing and re- cording of lantern slides is a problem not easily solved. The slides, to be sure, can be filed away in slide boxes according to the various subject c1h-m fications which they illustrate and a card file describ- ing the separate slides may he kept telling the actual location of the slides. But for the card file to be of real use. however, the individual cards should de- scribe in detail the exact nature of the slide, giving the teacher or student the assurance that any slide in question is just what is wanted. During the conduct of an experiment in Physics recently in which the frequency of vibration of a tuning fork was to be found, the students made blue prints of the tracing the tuning fork made on a piece of smoked glass, the glass having been immersed in shellac to keep the lamp-black from rubbing off. The writer then saw a possible solution to the lantern slide cataloguing problem. Why not make blue prints of lantern slides, just as blue prints of the tuning fork tracing on smoked glass were made? Lantern slides of every description were at hand. both professional types and student-made types. Samples of each were taken and blue prints of them were made. The results were highly gratifying, even for rapid work. The students were soon in- fected with the idea. Various members of the class attempted the task, and in most cases were greatly pleased with the results. The school has a library of several thousand slides, both professional and student-made types. To Directors of Visual Education Departments; to Instructors of Visual Education, and to Distributors of Visual Education Products: If you are interested in home-made slides you will welcome the announcement of a new product for malting ground glass inexpensively. GLASSIVE, an abrasive for glass has been compounded purposely for making ground glass from plain cover glassis. It reduces the cost of ground glass to a fraction of a cent beyond the cost of plain cover glass. With very little labor teachers and pupils can make excellent ground glass easily. One package of GLASSIVE will make more than one hun- dred slides. Price 50c a package TEACHING AIDS SERVICE, Waban, Mass. Dealers interested, please write The science department has taken the lead in the blue-printing of these slides. A member of the Bi- ology class has undertaken as a special project the making of blueprints of all the slides relating to Biology; a Physics student all those relating to Physics, and so on with the other sciences. Now. as new slides are make by the students, if they are to be made a part of the permanent collection of the school, a blue print is immediately made to accom- pany the slide. The technique involved in the making of the blue prints was the most simple one conceivable. The blue print paper was cut in sections 3x4 inches, in a darkened room. Then the student took the slide of which he was to make the blue print, and placed it on top of the sensitive side of the blue print paper so that the printing on the slide was readable. This combination was then placed on a piece of glass or cardboard and held in direct sunlight, the fingers keeping the paper closely pressed to the slide. The time of exposure of course varied, due to the density of the slide and the nature of the ma- terial of which the slide was composed. The aver- age time of exposure was about 25 seconds. The blue prints were then immediately washed in run- ning water and placed on end in a simple drying rack to hasten the drying. When thoroughly dry they were pressed smooth with an electric iron, then their edges were neatly trimmed and then pasted on filing cards 4x6 inches in size. This left enough space on the card to record the catalogue number of the slide, its location in the school, and other in- formation concerning the slide which might be of interest. The cards were then filed in cabinets un- der the various subject classifications. The slides made bv the students were of various Official BOULDER-DAM FILMS Made by United States Bureau of Reclama- tion and Boulder Dam Contractors. Edited for School use — 16 mm. film — 400 and 1200 footage. Write for Circular BOULDER DAM SERVICE BUREAU, INC. Boulder City, Nevada Official Motion Pictures Authentic Photos Booklet! of Boulder Canyon Project