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George Gabriel Stokes and William Hyde Wollaston Michael W Downloaded from https://www.cambridge.org/core MicroscopyPioneers Pioneers in Optics: George Gabriel Stokes and William Hyde Wollaston Michael W. Davidson . IP address: National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306 [email protected] 170.106.33.42 George Gabriel Stokes perhaps his most important optical research. The following is an (1819–1903) excerpt of his influential findings, which were read to the Royal , on Born in Ireland on August 13, 1819, George Stokes was Society of London on May 27, 1852: 29 Sep 2021 at 13:50:11 the youngest of six children. His father, a rector, directed his The following researches originated in a consideration of the early education before very remarkable phenomenon discovered by Sir John Herschel sending him to a school in in a solution of sulphate of quinine, and described by him Dublin. Stokes attended in two papers printed in the Philosophical Transactions for Bristol College in England, 1845, entitled “On a Case of the Superficial Colour presented , subject to the Cambridge Core terms of use, available at followed by Pembroke Col- by a Homogeneous Liquid internally colourless,” and “On lege at Cambridge Uni- the Epipolic Dispersion of Light.” The solution of quinine, versity, where he studied though it appears to be perfectly transparent and colourless, mathematics. He graduated like water, when viewed by transmitted light, exhibits in 1841 and was bestowed nevertheless in certain aspects, and under certain incidences with many honors, in- of the light, a beautiful celestial blue color. It appears from the cluding a fellowship that experiments of Sir John Herschel that the blue colour comes enabled him to remain at only from a stratum of fluid of small but finite thickness Cambridge. In 1849, Stokes adjacent to the surface by which the light enters. After passing was appointed Lucasian through this stratum, the incident light, though not sensibly Professor of Mathematics enfeebled nor colored, has lost the power of producing the and spent the rest of his life same effect, and therefore may be considered as in some way working at the prestigious or other qualitatively different from the original light. school. Throughout his career, Stokes emphasized the importance The noteworthy phenomenon observed by Stokes in https://www.cambridge.org/core/terms of experimentation and problem solving, rather than focusing quinine was that of fluorescence. Though Herschel had noted solely on pure mathematics. His practical approach served the occurrence previously, it was Stokes who revealed several him well, and Stokes made important advances in several important characteristics of the fluorophore. Most importantly, fields, most notably hydrodynamics and optics. An advocate Stokes understood that the celestial blue color was exhibited of the wave theory of light, Stokes was one of the prominent only near the surface where the light entered the relatively nineteenth-century scientists who believed in the concept of an concentrated quinine solution because the ultraviolet radiation of ether permeating space, which he supposed was necessary for the sun, or other light source, was completely absorbed by only light waves to travel. Though the existence of an ether was later a shallow layer of the substance. As he pointed out, the light was disproved, Stokes’s efforts in the area helped pioneer the science of “qualitatively different” after passing beyond this layer, or, more geodesy, the study of the Earth and its gravitational field. specifically, the ultraviolet was lacking in the remaining radiation. https://doi.org/10.1017/S1551929513000977 In hydrodynamics, Stokes investigated a number of These findings enabled Stokes to formulate what has come to be phenomena. Working in conjunction with Claude Navier, he known as Stokes Law, which holds that the wavelength of emitted developed a series of equations, known as the Navier-Stokes fluorescent light is always greater than the wavelength of the equations, which described the motion of viscous fluids. In 1850, exciting light. Closely associated to the law and frequently used for Stokes made another important contribution to the field when quantification purposes by scientists is Stokes shift, a measurement he published a treatise in which he mathematically described of the difference in wavelength or frequency between absorbed the fall of an object through a liquid. Based on his equations and and emitted quanta. the work of others in the field, Stokes was able to explain the Stokes’s early research in fluorescence served as the basis formation of clouds in the atmosphere. for much of his future work in optics. For example, he used An interest in light and its propagation led to Stokes’s many fluorescence for spectral analysis of ultraviolet radiation and experiments in optics. In 1849, he developed instruments and a eventually suggested that Fraunhofer lines were electronic method for measuring astigmatism in the eye, and by 1851 had transitions of elements that absorbed light of certain wavelengths invented a device that could be used to analyze polarized light. from the sun’s crust. However, during the second half of his It was not until 1852, however, that Stokes carried out what was career, Stokes expended an increasing amount of time carrying 46 doi:10.1017/S1551929513000977 www.microscopy-today.com • 2013 November Downloaded from https://www.cambridge.org/core. IP address: 170.106.33.42, on 29 Sep 2021 at 13:50:11, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S1551929513000977 Downloaded from MicroscopyPioneers https://www.cambridge.org/core out administrative roles in various academic and political bodies, acid. Twelve years later Wollaston provided the best contemporary leaving him with less time to perform original research. Elected physiological description of the ear. to the Royal Society in 1851, Stokes became its secretary in 1854, Wollaston formed another alliance to perform chemistry and remained in the position until he was elected its president studies and experiments, this time with Smithson Tennant. thirty years later. He also served as president of the Cambridge Platinum had long evaded the efforts of chemists to concentrate Philosophical Society for six years and acted as a member of and purify the precious element, and the pair decided to join in Parliament from 1887–1891. For his many scientific contributions, the endeavor. When Tennant first tried to produce platinum, Stokes received a number of honors before his death in 1903, the result was his discovery of the new elements iridium and including the Rumford Medal in 1852, the Copley Medal in 1893, osmium. Wollaston’s later attempt led him to the discovery . IP address: and a knighthood in 1889. of palladium and rhodium. He then invented the technique of William Hyde Wollaston powder metallurgy and produced malleable platinum in 1805. The (1766–1828) feat proved extremely profitable and provided him with financial 170.106.33.42 independence for the rest of his life. He waited until 1828, however, The quantity and diversity of William Hyde Wollaston’s to reveal the description of his secret process to the Royal Society. research made him one of the most influential scientists of his Wollaston made great strides in various disciplines of time. Although formally , on physics. In 1802, he developed the refractometer, an instrument trained as a physician, 29 Sep 2021 at 13:50:11 for determining refractive index. The device helped Wollaston Wollaston studied and verify the laws of double refraction in Iceland spar, on which made advances in many he wrote a treatise. Also in 1802, Wollaston discovered that the scientific fields, including sun’s spectrum is not a continuous gradient but is interrupted chemistry, physics, botany, by a number of dark lines. Joseph Fraunhofer made the same crystallography, optics, as- observation and precisely described the phenomenon twelve tronomy, and mineralogy. years later. In 1807, Wollaston developed a version of the camera , subject to the Cambridge Core terms of use, available at He is particularly noted for lucida, which would eventually lead to Fox Talbot’s discoveries in being the first to observe photography. dark lines in the spectrum The camera lucida largely consisted of a four-sided prism of the sun, discovering (the Wollaston prism) that has since proved indispensable in the elements palladium microscopic work. The invention was originally used as a drawing and rhodium, and prov- aid that allowed artists to draw outlines in proper perspective. A ing the elementary nature piece of paper was laid flat on a drawing board and the artist would of niobium and titanium. look through a lens mounted on a small stand that contained the Wollaston also developed prism. The observer’s eye was placed so that the pupil was half a method for making covered by the horizontal face of the prism, allowing him to see platinum metal malleable, establishing an equivalence between both the paper and a faint image of the subject, which he could galvanic and frictional electricity, and originating several then easily trace. Although the device was awkward to use, it made inventions in optics, including the Wollaston prism that is artistic renderings significantly simpler to produce and quickly fundamentally important to interferometry and differential grew in popularity. interference contrast (DIC) microscopy. As a skilled optician, Wollaston created a doublet lens https://www.cambridge.org/core/terms Wollaston was born in Norfolk, England, on August 6, consisting of two plano-convex lenses with their flat surfaces 1766, to a vicar, Francis Wollaston, and Althea Hyde. He facing the object plane. This important lens design was refined received his formal education at Charterhouse School and by Charles Chevalier in 1830 and later perfected by Joseph J. the Gonville and Caius Colleges of Cambridge University. He Lister as a high-resolution achromatic lens.
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