Recording Instrument for Use in Wind Tunnels
Throop College, Pasadena, Calif. The primary object of experiments in a wind tunnel is to obtain the magnitude of a force acting on a model, which force is produced by air moving through the tunnel at some known speed. The magnitude of the force is found by means of a special instrument called an aerodynamical balance and the speed of the air is measured by means of an alcohol manometer, generally of the Krell type, which is connected to a static pressure plate on one side of the tunnel.
By 8 min