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| | LowellCanals |
 | | If the background crater was too large or the aperture of the telescope was too large, then the dust had nothing for orientation supplied by the observer, to "direct" it, to "frame" it, as it were. |
 | | If all the necessary craters could be classed in the nearly same size range, then a double, the secondary, would parallel the original, the primary, canal for the duration of the course of the primary. |
 | | Again, if one crater at the start of a canal and one at the finish were large enough in the presence of increased dust, a double could be realized. |
| www.thespaceguy.com /lowellcanals.htm (3439 words) |
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