Amici Prism
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
The Amici prism, or direct-vision prism, consists of three or five prisms arranged to disperse white light into a spectrum without deviating the central rays from their original path. It is primarily used in technical optics.
Encyclopedia entry (1928–1936)
AMICI PRISM, or "direct-vision prism" (a vision directe), consists of three prisms (sometimes five): a middle flint-glass one and two lateral crown-glass ones, arranged with their refracting edges in opposite directions. The decomposition of a white ray into colored ones occurs without deviation of the middle rays of the spectrum from their initial direction; the yellow ray emerging from the prism is a continuation in direction of the incident white ray. The Amici prism is used mainly in technical optics.
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“Amici Prism.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/amici-prism/