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See also:SIR See also:EDWARD See also:FRANKLAND (1825-1899) , See also:English chemist, was See also:born at Churchtown, near See also:Lancaster, on the 18th of See also:January 1825 . After attending the See also:grammar school at Lancaster he spent 'six years as an apprentice to a druggist in that See also:town . In 1845 he went to See also:London and entered See also:Lyon See also:Playfair's laboratory, subsequently working under R . W . See also:Bunsen at See also:Marburg . In 1847 he was appointed See also:science-See also:master at Queenwood school, See also:Hampshire, where he first met J . See also:Tyndall, and in 1851 first See also:professor of See also:chemistry at See also:Owens See also:College, See also:Manchester . Returning to London six years later he became lecturer in chemistry at St See also:Bartholomew's See also:hospital, and in 1863 professor of chemistry at the Royal Institution . From an See also:early See also:age he engaged in See also:original See also:research with See also:great success . See also:Analytical problems, such as the See also:isolation of certain organic radicals, attracted his See also:attention to begin with, but he soon turned to synthetical studies, and he was only about twenty-five years of age when an investigation, doubtless suggested by the See also:work of his master, Bunsen, on cacodyl, yielded the interesting See also:discovery of the organo-metallic compounds . The theoretical deductions which he See also:drew from the See also:consideration of these bodies were even more interesting and important than the bodies themselves . Perceiving a molecular isonomy between them and the inorganic compounds of the metals from which they may be formed; he saw their true molecular type in the See also:oxygen, See also:sulphur or See also:chlorine compounds of those metals, from which he held them to be derived by the substitution of an organic See also:group for the oxygen, sulphur, &c .
In this way they enabled him to over-throw the theory of conjugate compounds, and they further led him in 1852 to publish the conception that the atoms of each elementary substance have a definite saturation capacity, so that they can only combine with a certain limited number of the atoms of other elements
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The theory of See also:valency thus founded has dominated the subsequent development of chemical See also:doctrine, and forms the groundwork upon which the fabric of See also:modern structural chemistry reposes
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In applied chemistry See also:Frankland's great work was in connexion with See also:water-See also:supply
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Appointed a member of the second royal See also:commission on the pollution of See also:rivers in 1868, he was provided
which, for a See also:period of six years, he carried on the inquiries necessary for the purposes of that See also:body, and was thus the means of bringing to See also:light an enormous amount of valuable See also:information respecting the contamination of rivers by sewage, See also:trade-refuse, &c., and the See also:purification of water for domestic use
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In 1865, when he succeeded A
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W. von See also:Hofmann at the School of Mines, he undertook the See also:duty of making monthly reports to the registrar-See also:general on the See also:character of the water supplied to London, and these he continued down to the end of his See also:life
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At one See also:time he was an unsparing critic of its quality, but in later years he became strongly convinced of its general excellence and wholesomeness
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His analyses were both chemical and bacteriological, and his dissatisfaction with the processes in See also:vogue for the former at the time of his See also:appointment caused him to spend two years in devising new and more accurate methods
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In 1859 he passed a See also:night on the very See also:top of Mont See also:Blanc in See also:company with See also: He found that pressure increases luminosity, so that See also:hydrogen, for example, the See also:flame of which in normal circumstances gives no light, See also:burns with a luminous flame under a pressure of ten or twenty atmospheres, and the inference he drew was that the presence of solid particles is not the only See also:factor that determines the light-giving See also:power of a flame, Further, he showed that the spectrum of a dense ignited See also:gas resembles that of an incandescent liquid or solid, and he traced a See also:gradual See also:change in the spectrum of an incandescent gas under increasing pressure, the See also:sharp lines observable when it is extremely attenuated broadening out to nebulous bands as the pressure rises, till they See also:merge in the continuous spectrum as the gas approaches a density comparable with that of the liquid See also:state . An application of these results to See also:solar physics in See also:con-junction with See also:Sir See also:Norman See also:Lockyer led to the view that at least the See also:external layers of the See also:sun cannot consist of See also:matter in the liquid or solid forms, but must be composed of gases or vapours . Frankland and Lockyer were also the discoverers of See also:helium . In 1868 they noticed in the solar spectrum a See also:bright yellow See also:line which did not correspond to any substance then known, and which they therefore attributed to the then hypothetical See also:element, helium . Sir See also:Edward Frankland, who was made a K.C.B. in 1897, died on the 9th of See also:August 1899 while on a See also:holiday at Golaa, Gudbrandsdalen, See also:Norway . A memorial lecture delivered by Professor H . E . See also:Armstrong before the London Chemical Society on the 31st of See also:October 19oi contained many See also:personal details of Frankland's life, together with a full discussion of his scientific work; and a See also:volume of Autobiographical Sketches was printed for private circulation in 1902 . His original papers, down to 1877, were collected and published in that See also:year as Experimental Researches in Pure, Applied and See also:Physical Chemistry . |
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