Discussion
Open area and capacity for four screen configurations.
| Aperture (mm) | Pitch (mm) | Open area | Relative capacity |
|---|---|---|---|
| 3.0 round | 5.0 | 0.283 | 1.00 |
| 4.0 round | 6.0 | 0.349 | 1.23 |
| 5.0 round | 7.0 | 0.401 | 1.42 |
| 4.0 round | 5.5 | 0.416 | 1.47 |
What does the last row show compared with the second?
Answer: A
Both rows use a four millimetre hole, but the closer pitch packs more of them into the same area and lifts capacity by a fifth. The limit on how far the pitch can be tightened is the strength left in the remaining metal.
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