Milestones of Science Books

THOMSON, Joseph John.

JOSEPH JOHN THOMSON: A group of 8 important offpints on physics and chemistry.

1894-1914.

1st Edition. Soft cover. Very Good. Item #001904

1. Electric Discharge Through Gases. Offprint from: Proceedings of the Royal Institution of Great Britain, April 1894. 8vo, 9 pp. Stapled as issued. ---- 2. Some Applications of the Theory of Electric Discharge to Spectroscopy. Offprint from: Proceedings of the Royal Institution of Great Britain, January 1906. 8vo, 14 pp. Stapled as issued. ---- 3. Rays of Positive Electricity. Offprint from: Proceedings of the Royal Institution of Great Britain, March 1907. 8vo, 16 pp. Stapled as issued. ---- 4. The Carriers of Positive Electricity. Offprint from: Proceedings of the Royal Institution of Great Britain, April 1908. 8vo, 31 pp. Stapled as issued. ---- 5. Electrical Striations. Offprint from: Proceedings of the Royal Institution of Great Britain, April 1909. 8vo, 10 pp. Stapled as issued. ---- 6. A New Method of Chemical Analysis. Offprint from: Proceedings of the Royal Institution of Great Britain, April 1911. 8vo, 9 pp. Stapled as issued. ---- 7. Some Further Applications of the Method of Positive Rays. Offprint from: Proceedings of the Royal Institution of Great Britain, January 1913. 8vo, 9 pp. Stapled as issued. ---- 8. Further Researches of Positive Rays. Offprint from: Proceedings of the Royal Institution of Great Britain, April 1914. 8vo, 6 pp. Stapled as issued. ----

In 1913, as part of his exploration into the composition of canal rays, Thomson channelled a stream of ionized neon through a magnetic and an electric field and measured its deflection by placing a photographic plate in its path. Thomson observed two patches of light on the photographic plate, which suggested two different parabolas of deflection. Thomson concluded that neon is composed of atoms of two different atomic masses (neon-20 and neon-22), that is to say of two isotopes. This was the first evidence for isotopes of a stable element; Frederick Soddy had previously proposed the existence of isotopes to explain the decay of certain radioactive elements. Thomson's separation of neon isotopes by their mass was the first example of mass spectrometry, which was subsequently improved and developed into a general method by Thomson's student F. W. Aston and by A. J. Dempster. (Wikipedia).

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