**PURPOSE: **For use as a model in developing equations for fluid flow.

**DESCRIPTION: **Flow of fluid onto surface *Q* is given by the equation

*Q*=d **v** d**A** cos* a* = d v dA(projection),

where d is the density of the fluid,** v** is the velocity of flow, A is the vector area of the surface, and *a* is the angle betwee
n the surface and the flow.

**SUGGESTIONS: **

**REFERENCES: ** (PIRA
unavailable.)

**EQUIPMENT: **Model as photographed.

**SETUP TIME: **None.