3 images. Satellite tracker, 17 March 1958. Jack Pattison (radio officer); Doctor Henry Richter (Research group supervisor of Caltech Jet Propulsion Laboratory); Robert Legg (Communications Officer, Temple City Civil Defense).; Caption slip reads: "Photographer: Lou Mack. Date: 1958-03-17. Reporter: Twiss. Assignment: Satellite tracker 17/18/40/41: L/R - Jack Pattison radio officer of Temple City Civil Defense; Dr. Henry Richter, research group supervisor, Caltech Jet Prop. Lab; and Robert Legg, Communication Officer Temple City Civil Defense. 50/51: Dr. Henry Richter points to signal strength recorder".