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The third of the Herschelian myths was the lunar volcano in eruption, which he supposed he had seen in progress in that part of the moon which was not at the time illuminated by the sun's rays. He saw a bright star-like point of light, which corresponded in position with the crater of the lunar mountain Aristarchus.
Its construction was of the Newtonian kind, the observer looking into the side of the tube near its upper end, which a series of galleries and sliding stages enabled him to reach in any position. It has also, though rarely, been used without a second mirror, as a "Herschelian" reflector. The splendour of the celestial objects as viewed with this vast "light-grasper" surpassed all expectation.
The resulting catalogue of 795 stellar systems gave the signal for a general resumption of the Herschelian labours in this branch.
"It appeared," he said, "as if some prodigious ascending force of a whirlwind character, in bursting through the cloudy stratum and the two higher and luminous strata, had given to the whole a movement resembling its own." An interpretation founded, as is easily seen, on the Herschelian theory, then still in full credit. An instance of the same kind was observed by Mr.
Objections have been raised to the Herschelian view on the ground that it assumes an approximately uniform distribution of the stars in space.
Happily, however, the unanswerable arguments of the photographic camera were soon to be made available against such hardy incredulity. Thus, the virtual discovery of the solar appendages, both coronal and chromospheric, may be said to have been begun in 1842, and completed in 1851. The current Herschelian theory of the solar constitution remained, however, for the time, intact.
Professor Airy received a copy of this paper before the end of the month, and was astonished to find that Leverrier's theoretical place for the planet was within 1° of the place Adams had assigned to it eight months before. So striking a coincidence seemed sufficient to justify a Herschelian sweep for a week or two. But a sweep for so distant a planet would be no easy matter.
There was also a clumsy reflecting telescope made on the Herschelian plan, but of very great simplicity, which was put up on fine nights in the same back yard, when the neighbors used to flock in to look at the moon. Afterwards Mr. Mitchell bought a small Dolland telescope, which thereafter, as long as she lived, his daughter used for "sweeping" purposes.
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