Abstract: An airflow metering device, including a conventional airflow sensing device signally connected to a signal processor is shown, having an input flow signal correlatable to a magnitude of mass air flowing past the airflow sensing device. The signal processor is operable to determine a flow correction factor based upon a direction and magnitude of the mass air flowing past the airflow sensing device. The output of the airflow metering device is an accurate measure of airflow, and comprises the input flow signal of the airflow sensing device adjusted by the flow correction factor determined by the signal processor.

Abstract: A synthetic bristle including a substantially continuous phase of polymer with spaced-apart microparticles in the interior thereof, at least some of said microparticles being close to the surface thereof for creating rough and irregular surface regions. The bristle can include a blowing agent in it, in addition to the microparticles, and the microparticles preferably are hollow glass beads. Brushes employing at least 5% by weight of the bristles of this invention also constitute a part of this invention, with the preferred brushes being applicator brushes, such as paintbrushes.