The round discharge tube has a larger central chamber and provides a broad, highly visible glow from multiple viewing angles. Its spherical shape makes it suitable for general field detection, equipment demonstrations, and observing relative changes in field strength around a central area.
The rounded glass enclosure allows the discharge to develop within a wider internal volume, making the glow easy to observe from different directions.
| Feature | Round tube | Straight tube |
|---|---|---|
| Glass shape | Spherical or rounded | Long cylindrical tube |
| Glow pattern | Concentrated within a broad central area | Distributed along the tube length |
| Viewing angle | Easy to observe from multiple directions | Best observed from the side |
| Field observation | General presence and relative strength | Direction, distribution and approximate active length |
| Orientation sensitivity | Relatively less directional | More useful for orientation comparison |
| Typical use | General testing and demonstration | Linear field comparison and distribution observation |
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