Photography has made important advances during the last decade. It is a more effective aid than wax models and colored photographs can also frequently be used instead of living patients for lectures and meetings. This is important in teaching, because patients do not like to be examined by a large number of students.
Our experience with the use of colored television in demonstrating dermatological cases at the Geneva medical society led us to believe that there is an advantage in projecting the picture on a large screen. For this reason we have experimented in attempting to project our colored slides (24 X 36 mm.) on a large screen which is 5 X 5 meters.
The projectors which are now available are equipped with an object glass having a focal distance varying between 75 and 85 mm. An object glass having a focal distance of 80 mm. makes it possible to project the slides with
JADASSOHN W, HOFER R. Projection of Colored Slides on a Large Screen. Arch Dermatol. 1961;84(6):1030. doi:10.1001/archderm.1961.01580180146026
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