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In nature, this self-registration is incessant, and the narrative is the print of the seal. It neither exceeds nor comes short of the fact. But nature strives upward; and, in man, the report is something more than print of the seal. It is a new and finer form of the original. The record is alive, as that which it recorded is alive.
Scheiner's spectrographic researches at Potsdam in 1890 and subsequently, exemplify the immense advantages of self-registration. In a restricted section of the spectrum of Capella, he was enabled to determine nearly three hundred lines with more precision than had then been attained in the measurement of terrestrial spectra.
Common, endowed, by its extremely short focal length of forty-five, combined with an aperture of twenty inches, with a light-concentrating force capable, it was hoped, of compelling the very filmiest coronal branches to self-registration.
The method of his observations, moreover, was chosen with the same practical sagacity as their objects. As early as 1847, Sir John Herschel had recommended the daily self-registration of sun-spots, and he enforced the suggestion, with more immediate prospect of success, in 1854.
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