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  • Theory of Colours Part II Section XXIX - Combination of Subjective and Objective Experiments; Section XXX - Transition

    Theory of Colours Part II Section XXIX - Combination of Subjective and Objective Experiments; Section XXX - Transition
    2026/07/14
    In which the nature of colour is discreetly examined through its dependence on light, reflection, and the conditions of observation, revealing the intimate relationship between colour and its luminous surroundings. The discourse further contemplates the processes of colour extraction, permanence, and nomenclature, illumining the delicate balance betwixt natural phenomena and the artifice of human endeavour in the realm of hues.
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    8 分
  • Theory of Colours Part II Sections XXV to XXVIII

    Theory of Colours Part II Sections XXV to XXVIII
    2026/07/13
    In which the mutable nature of colour is explored through the means by which it may be fixed in substances, especially via natural pigments and their intimate union with various materials, leading to permanence and enhancement of brightness. Furthermore, the interplay of real and apparent intermixtures of colours—whether by physical blending, optical effects, or layering—illuminates the subtle gradations and complex relations of colours as they communicate and transform within diverse contexts.
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    11 分
  • Theory of Colours Part II Section XXIII - Conditions of the Increase of Colour; Section XXIV - Explanation of the Foregoing Phenomena

    Theory of Colours Part II Section XXIII - Conditions of the Increase of Colour; Section XXIV - Explanation of the Foregoing Phenomena
    2026/07/12
    In which the gradual intensification of colour is observed through natural phenomena and chemical processes, revealing a delicate interplay that culminates in vivid reds and subtle shifts known as fluctuation. The exploration further uncovers the passage of hues through the chromatic scale and the curious inversion of colours, exemplified by certain minerals and dyes that transform before the eye.
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    8 分
  • Theory of Colours Part II Objective Experiments - Section XXI and XXII

    Theory of Colours Part II Objective Experiments - Section XXI and XXII
    2026/07/11
    In which the nature of white and black is delicately explored through their occurrences in water, earths, and metals, revealing how white arises from separate transparent parts and black often from semi-combustion and subtle oxydations. The text further investigates the initial excitation and augmentation of colour, noting how metals and earths respond to various states of oxidation with changes in hue, and how colour deepens and transforms under differing conditions of opacity and light.
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    9 分
  • Theory of Colours Part II Section XVI - Decrease of the Appearance of Colour; Section XVII - Grey Objects Displaced by Refraction

    Theory of Colours Part II Section XVI - Decrease of the Appearance of Colour; Section XVII - Grey Objects Displaced by Refraction
    2026/07/08
    In which the delicate interplay of light and shadow is explored through experiments with varying distances and apertures, revealing how the sun’s image enlarges and softens upon surfaces, leading to subtle gradations of brightness and the faint emergence of colour. These observations gently caution against simplistic notions of parallel rays, instead inviting us to appreciate the splendour of luminous images that produce double shadows edged with colour and create an almost infinite multiplication of radiant halos.
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    7 分
  • Theory of Colours Part II Section XIV - Conditions Under Which the Appearance of Colour Increases

    Theory of Colours Part II Section XIV - Conditions Under Which the Appearance of Colour Increases
    2026/07/06
    In which the interplay of glass elements in achromatic object-glasses is carefully examined, revealing how colours emerge and vanish through combinations of convex and concave lenses; the observer is then invited to consider the intriguing effects when subjective and objective refractions meet, demonstrating their mutual neutralisation and complex modulation of the sun’s image. Reflecting on the detailed investigations, a thoughtful pause is taken to justify the thoroughness of these inquiries, hopeful that future minds may distil such complexities into simpler truths.
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    5 分
  • Theory of Colours Part II Subjective Experiments - Sections XII and XIII

    Theory of Colours Part II Subjective Experiments - Sections XII and XIII
    2026/07/05
    In which the delicate gradations and separations of coloured appearances are explored with attentive care, revealing how proximity to the refracting medium alters the vividness and blending of colours. The discourse further unfolds varied methods to produce and observe coloured images objectively, culminating in experiments that elegantly demonstrate achromatism and hyperchromatism through the interplay of prisms and coloured glasses.
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    7 分
  • Theory of Colours Part II Section XI - Diotropical Colours of the Second Class - Refraction

    Theory of Colours Part II Section XI - Diotropical Colours of the Second Class - Refraction
    2026/07/04
    In which the delicate interplay of light and dark boundaries, as they traverse and overlie each other through prisms and apertures, reveals the conditions under which colour manifests and intensifies in both subjective and objective observations. The subtle gradations and movements of these coloured fringes upon luminous images, particularly those cast by the sun, are elegantly traced and diagrammed, demonstrating that the spectrum is neither static nor uniform but a living phenomenon shaped by displacement, perspective, and medium.
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    8 分