| 摘要 |
<p>The fan is for a transparency projector and allows the use of a powerful bulb. The fan is at the projector door to give as much air flow as possible to the transparency. It does, in fact, replace the door. The objective is held by an open cylindrical ring, inside the projector and fixed on it. The fan has a box (1) and in this is a helicoidal fan (2). The box turns on an axis (3) and there is a retaining spring (4). A strip (5) fitted to the fan holds the condensers and filter locked.</p> |
