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RECHERCHES SUR LE SPECTRE SOLAIRE. UPPSALA: W. SCHULTZ, 1868
2 volumes, text volume 4to (308 x 235mm.), atlas volume oblong folio (325 x 510mm.), 6 engraved plates, both volumes in original printed wrappers, atlas volume unbound as issued, atlas wrapper a little creased
LITERATURE
Norman 56
NOTE
first edition of one of the founding works of spectroscopy, which contains "an atlas of the solar spectrum with measurements of the wavelengths of approximately a thousand lines determined by the use of diffraction gratings. Ångström expressed his results in units of one ten-millionth of a millimeter - a unit of length that has been named the angstrom unit in his honor" (DSB I, p.166).
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