Ladd-Franklin, Christine (redirected from Christine Ladd)

Ladd-Franklin, Christine, 1847–1930, American scientist, b. Windsor, Conn., grad. Vassar 1869. She was the first woman student to enter Johns Hopkins (1878), her special studies being directed toward logic and the theory of color. She studied in Göttingen (1891–92) and worked in Helmholtz's laboratory, developing the theory of color vision that bears her name and that is described in Colour and Colour Theories (1929), a collection of her papers.

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Ladd-Franklin, Christine

 orig. Christine Ladd

(born Dec. 1, 1847, Windsor, Conn., U.S.—died March 5, 1930, New York, N.Y.) U.S. scientist and logician. She fulfilled Ph.D. requirements at Johns Hopkins University in the 1880s, but, because women candidates were not recognized, she was not awarded her degree until 1926. In symbolic logic, she reduced syllogistic reasoning to an inconsistent triad with the introduction of the antilogism, a form that made the testing of deductions easier. The Ladd-Franklin theory of colour vision stressed increasing colour differentiation with evolution and assumed a photochemical model for the visual system. Her principal works are The Algebra of Logic (1883), The Nature of Color Sensation (1925), and Color and Color Theories (1929).

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Ladd-Franklin, Christine (1847–1930) psychologist, logician; born in Windsor, Conn. She studied mathematics at Johns Hopkins University, where she married faculty member Fabian Franklin (1882). In 1883 she proposed the "antilogism," a syllogism concluding that if any two premises are true, the third must be false. Her experiments in psychological optics began in 1886, and she presented her theory of color vision to the International Congress of Psychologists in London in 1892. She taught at Columbia University from 1910 to 1930.