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Preliminary illustrations were made by tracing the projected images of outstanding performers from slow-motion-picture films. These sketches and the progressions, with pertinent questions about disputed points on form, sequence, and nomenclature, were subjected to a personal, detailed criticism by seventeen leading tumbling instructors in Southern California. Seven other outstanding instructors in various parts of the country made written criticisms of hectographed copies of the manual. Each criticism of the illustrations and written material was objectively recorded. From these recorded criticisms an objective average of good form and teaching method was established. |
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