Demos by PIRA

9A10 Blackboard Tools

9A20 Audio

9A30 Slide Projectors

  9A30.20Lantern slide projector with removable housing.

9A34 Film Projectors

9A36 Overhead Projectors

9A38 Video & Computer Projection

9A40 Photography

9A50 X-Y, Chart Recorders

9A60 Buildings

9A65 Museums

9A70 Resource Books

9A73 Unclassified Demonstrations

9A75 Philosophy

9A80 Films

  9A80.40Film: "Interference of photons", sound 13 min.
  9A80.40Film: "Photons", sound, 19 min..

9A85 Computer Programs