| 摘要 |
The cowl has a series of annular bodies (4, 5, 6) set one above the other, and a deflector (12) situated above the second annular body from the top and extending radially over its upper circular aperture (8a). The annular bodies are basically in the shape of inverted dishes with cylindrical rims (10, 10a, 10b) projecting downwards from their edges. The cowl has at least two vertical supports (2, 3), and the deflector and uppermost annular body are fitted detachably to the supports' upper ends, e.g. by screws with knurled heads (17, 18).
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