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    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Spectrum of "red to orange" stars, particularly Alpha Orion and Antares. Secchi included Alpha Herculis, Beta Pegasi, Alpha Orion, and Antares in this third of four classes of stars.

    Fig. 2: Spectrum of…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Spectrum of "yellow" stars. Secchi included the sun, Pollux, Arcturus, Aldebaran, and Procyon in this second of four classes of stars.

    Fig. 2: Spectrum of "white" stars. Secchi included Sirius, Vega, Altair,…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Janssen (Pierre Jules César Janssen)
    Fig. 2: Brewster (David Brewster)
    Fig. 3: V. der Willingen (Volkert Simon Maarten van der Willigen)

    Secchi used these three solar spectra to illustrate how the position of…

    • Chromatic scale of tones: grey
    • 1864

    The gamut of grey tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: orange-yellow
    • 1864

    The gamut of orange-yellow tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: orange
    • 1864

    The gamut of orange tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: red-orange
    • 1864

    The gamut of red-orange tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: red
    • 1864

    The gamut of red tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: yellow
    • 1864

    The gamut of yellow tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: green-blue
    • 1864

    The gamut of green-blue tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: yellow-green
    • 1864

    The gamut of yellow-green tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: green
    • 1864

    The gamut of green tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: blue
    • 1864

    The gamut of blue tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: blue-purple
    • 1864

    The gamut of blue-purple tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: purple
    • 1864

    The gamut of purple tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: purple-red
    • 1864

    The gamut of purple-red tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Circular zone of continuous colors
    • 1864

    Inscribed: "Zône circulaire dont les couleurs sont continues. On la suppose formée d’une reunion de zônes excessivement étroites et contigues parmi lesquelles il en est trois qui sont a des distances égales, RR, JJ, et…

    • Third chromatic circle
    • 1864

    Inscribed: "3ème cercle chromatique de Mr. Chevreul renfermant les couleurs rabattues, à 2/10 de noir."

    Chevreul’s third chromatic circle shows the 72 pure hues from Plate V subdued with 2/10 black.

    • First chromatic circle containing pure colors
    • 1864

    Inscribed: "1er cercle chromatique de Mr. Chevreul renfermant les couleurs franches."

    Chevreul’s first chromatic circle shows 72 colors in their purest hues.

    • Second chromatic circle
    • 1864

    Inscribed: "2ème cercle chromatique de Mr. Chevreul renfermant les couleurs rabattues, à 1/10 de noir."

    Chevreul’s second chromatic circle shows the 72 pure hues from Plate V subdued with 1/10 black.

    • Scale of blue tones
    • 1864

    Inscribed: "Manière dont Mr. Chevreul conçoit qu'une couleur qui est indéfinie en allant du blanc au noir est distinguée en parties définies qu'il appelle tons."

    Chevreul presents the gamut of a pure color—blue—from…

    • Circular zone divided into 72 equal parts
    • 1864

    Inscribed: "C’est la Planche 3 divisée en 72 parties égales avec cette condition que les zônes représentant le rouge, le jaune et le bleu, partagent en deux moities les trois parties où elles se trouvent."

    This plate…

    • Fourth chromatic circle
    • 1864

    Inscribed: "4ème cercle chromatique de Mr. Chevreul renfermant les couleurs rabattues, à 3/10 de noir."

    Chevreul’s fourth chromatic circle shows the 72 pure hues from Plate V subdued with 3/10 black.

    • Fifth chromatic circle
    • 1864

    Inscribed: "5ème cercle chromatique de Mr. Chevreul renfermant les couleurs rabattues, à 4/10 de noir."

    Chevreul’s fifth chromatic circle shows the 72 pure hues from Plate V subdued with 4/10 black.

    • Sixth chromatic circle
    • 1864

    Inscribed: "6ème cercle chromatique de Mr. Chevreul renfermant les couleurs rabattues, à 5/10 de noir."

    Chevreul’s sixth chromatic circle shows the 72 pure hues from Plate V subdued with 5/10 black.