His wife was an heiress; and on the death of his childless uncle, Hartmann VI.
complex spectra of stars of the solar type this is by no means the case; for, as Dr Hartmann remarks, " in the first place the lines in these spectra are so numerous that their complete measurement and reduction would require many days, and in the second place a rigorous reduction of such material has hitherto not been at all possible because the wave-lengths of the lines are not known with sufficient accuracy.
Hartmann overcame these and many other difficulties by directly superposing the image of the spectrogram of a star, having iron comparison lines, upon the image of a spectrogram of the sun taken also with iron comparison lines.
IMMANUEL HERMANN FICHTE (originally [[Hartmann) Von]] (1797-1879), German philosopher, son of J.
(1902); article by Karl Hartmann in Allegemeine deutsche Biographie xlviii.