An evaluation of the overhead projector in teaching kinematics
"The overhead projector has been used as a teaching aid for several years, in elementary education and in engineering drawing. No use of an overhead projector in kinematics has been reported, nor has there been a statistical evaluation of its effectiveness in engineering education. In the spring of 1959, the author taught two sections of kinematics. In one section, the lectures were written to include blackboard sketches and demonstrations; in the other section the lectures were written to include transparent overlays prepared for the overhead projector. Each transparent overlay presentation consisted of a step by step development of the lecture with one step on each of the transparent sheets. As the lecture progressed, the overlays were exposed to convey the pertinent information visually to the student."--Page 827.