| 摘要 |
<p>Inventor: Raymond C. Price Title: APPARATUS TO DEMONSTRATE AIR FLOW THROUGH PERMEABLE SHEET MATERIAL An apparatus to demonstrate air flow through sheet material such as carpeting and padding to provide a qualitative, visual test of the permeability of the material. A transparent, closed container is connected with a vacuum pump to pull air thereinto from an opening at the bottom of the container which is traversed and closed by a sample of the sheet material to be tested. Thus, air flows into the container by passing through the sheet material. Lightweight objects within the container are agitated by air movement and the manner and intensity with which they are bounced and tossed within the container provides for a spectacular, qualitative demonstration of the permeability of the material. Also, a simple comparsion of one material with another is possible with the apparatus.</p> |
