text: The teal believers of these concepts ate pro- 
  fessional instrument pilots, LSO’s, and glider 
  pilots.. The glider pilot (or flameout enthusi- 
  ast) has no recourse but to control airspeed by 
  angle of attack and accept whatever rate of 
  descent is incurred at the various airspeeds. 
  The LSO must become quite proficient at judg- 
  ing the flight path and angle of attack of the 
  airplane in the pattern. The more complete 
  visual reference field available to 
  the LSO 
  allows him to judge the angle of attack of 
  the airplane mote accurately than the pilot. 
  When the airplane approaches the LSO, the 
  precise judgment of airspeed is by the angle 
  of attack rather than the rate of closure. 
  If 
  the LSO sees the airplane on the desired flight 
  path but with too low an angle of attack, the 
  airspeed is too high; if the angle of attack is 
  too high, the airspeed is too low and the ait- 
  plane is approaching the stall. The mirror 
  landing system coupled with an angle of attack 
  indicator is an obvious refinement. The mit- 
  tot indicates the desired flight path and the 