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c1861 Born at Ely
1911 Living at Ravenscroft, Roman Road, Middlesbro: Charles Henry Ridsdale (age 50 born Ely), Metallurgical Analyst. With his wife Jessie Ridsdale (age 48 born Studkey, Wks.) and their two children; Noel Douglas Ridsdale (age 21 born Hutton Lowcross, Yks.), Metallurgical Analyst and Constance Eric Ridsdale (age 16 born Hutton Lowcross, Yks.). Two servants.
1935 Obituary 
CHARLES HENRY RIDSDALE, of Stoneycroft, Glaisdale, passed away on December 29, 1934, at the age of seventy-three.
He first went to Tees-side in 1876, and there he became one of the first pupils in the laboratory of the late Dr. Stead.
In 1879 he was associated with some of the early experiments carried out by Thomas and Gilchrist at the works of Messrs. Bolckow, Vaughan & Co., at South Bank, the outcome of which was the successful development of the basic Bessemer process, which made possible the manufacture of steel from local phosphoric ores.
Later, Mr. Ridsdale was appointed chief chemist and technical adviser to the North-Eastern Steel Works, Ltd., of Middlesbrough.
In 1917, he joined Messrs. Ridsdale & Co., analytical chemists, of Middlesbrough, and later became a director of and metallurgical consultant to the firm, in which his son, Mr. N. D. Ridsdale, now takes a principal part. He was a member of a number of technical societies, including the Chemical Society, the Institute of Chemistry and the Cleveland Institution of Engineers; he had joined the Iron and Steel Institute in 1883.
He was the author of very many papers on technical matters, a number of which will be found in the Journal of the Iron and Steel Institute; in 1887, jointly with Dr. Stead, he presented a paper on "Basic slag, its formation, constitution and application, with special reference to crystals found therein," and then followed contributions on "Brittleness in soft steel," in 1895, on "Practical microscopic analysis for use in the steel industries, with an introduction to a systematic study of soft and dead soft steel," in 1899, on "The correct treatment of steel," in 1901, on "Diseases of steel," in 1903, and finally on "The valuation of ores and iron- making material," in 1920. In addition, he had collaborated with his son, Mr. N. D. Ridsdale, in two papers presented to the Institute, one on "Mechanicalising analysis as an aid to accuracy and speed for commercial purposes," in 1911, and the other on "A new method for the accurate determination of phosphorus," in 1913.
Mr. Ridsdale was the originator of standard analytical samples, and he had devoted much time and energy to their improvement and development.