text: If a sym- 
  metrically shaped object were placed in a 
  moving airstream, the flow pattern typical of 
  figure 1.4 would result. The airstream at the 
  very nose of the object would stagnate and the 
  relative flow velocity at this point would be 
  zero. The airflow ahead of the object pos- 
  sesses some certain dynamic pressure and 
  ambient static pressure. At the very nose of 
  the object the local velocity will drop to zero 
  and the airstream dynamic pressure will be 
  converted into an increase in static pressure at 
  the stagnation point. 
  In other words, there 
  will exist a static pressure at the stagnation 
  point which 
  is equal to the airstream total 
  pressure-ambient static pressure plus dynamic 
  pressure. 
  
  AIRSPEED MEASUREMENT. 
  
  Around the surface of the object the airflow 
  will divide and the local velocity will increase 
  from zero at the stagnation point 
  to some 
  maximum on the sides of the object. 
  If fric- 
  tion and viscosity effects are neglected, the 
  
  9 