Recherches sur le Spectre Solaire. [Atlas contenant les longeurs d'onde des raies Frauenhofériennes données en 1/10,000000 de millimètre].
Uppsala: W. Schultz, 1868.
1st Edition. Hardcover. Oblong folio. Very Good. Item #003465
Two parts comprising text volume and atlas with plates. Text volume: 4to (310 x 238 mm), Plate volume: oblong folio (340 x 540 mm). Text volume: , 42, xv  pp. and lithographed frontispiece. Atlas volume: title sheet and 6 sheets of lithographed plates. Original publisher's printed wrappers (front wrapper of atlas stained, with minor paper repair and tanning). Housed in a custom-made cassette. Plates unbound as issued. Text and plates with little age-toning only, the text volume very crisp and clean, the title sheet of the atlas with unobtrusive brown stain at foot. An exceptional, unsophisticated copy. ----
DSB I, p. 166; Norman 56; Honeyman 096. - RARE FIRST EDITION. The classic work on the solar system in which Angström demonstrated the presence of hydrogen and a number of other elements in the sun. Solar spectroscopy provided the first scientific evidence (other than the occasional meteorite) that the elements known on earth are also present elsewhere in the universe. Angström also established a scale of wave-lengths for measuring spectral lines, replacing Kirchoff's arbitrary scale. Angström's system was based on a unit of one ten millionth of a millimetre, named the "Angström unit" in his honor. He conducted detailed measurements of more than 1000 spectral lines. The plates are in effect a map of the solar spectrum, and show the radiation of the solar spectrum ranging from 0.8 to 0.4 micron and from red to purple colour. It identifies the particular lines of manganese, aluminium and titanium. The lithographic plates are after R. Thalén (1827-1905), Angström's laboratory assistant. The lithographic frontispiece to the text volume is showing Angström's spectrometer. Some copies have a further 2 plates showing the ultraviolet spectrum, but the Norman, Gedeon, Green and Honeyman copies - like the present copy - do not have these. - Visit our website to see more images!
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