ferrometern.
/fəˈrɒmᵻtə/, U.S. /fəˈrɑmədər/ 1. A device for automatically feeding ferrous sulphate into domestic waste water, for water purification purposes. Cf. ferozone n. Now disused.
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1887 Amer. Engineer 1 June 193/2 The Ferrometer, a new instrument of domestic sanitation.
1910 W. H. Maxwell & J. T. Brown Encycl. Munic. & Sanitary Engin. 82/2 A small stream of water flows through the ferrometer, dissolves the sulphate of iron, and carries it into the sewers.
2. Medicine. An instrument for determining the amount of iron in a person's blood.
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1897 Pharmaceut. Jrnl. 27 Nov. p. xi/1 Dr. Jolles' Ferrometer for the determination of iron in the blood.
1905 N. B. Potter tr. H. Sahli Treat. Diagnostic Methods Exam. 672 It takes about ten to fifteen minutes to estimate the amount of iron with Jolles' ferrometer.
2002 Tri-Valley Herald (Pleasanton, Calif.) (Nexis) 24 Mar. The building will house a state-of-the-art Ferrometer, used to measure iron levels in the blood.
3. Physics. An instrument for determining the magnetic properties of a ferromagnetic substance.
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the world > matter > physics > electromagnetic radiation > magnetism > types of magnetism > [noun] > ferromagnetism > body or substance > instrument determining properties of
ferrometer1935
1935 Sci. Abstr. B. 38 272 A description of the extension of the use of the ferrometer to the delineation of hysteresis loops.
1951 R. M. Bozorth Ferromagnetism xix. 854 (caption) Basic circuit of the ferrometer, for determining current-voltage characteristics of a material, using a phase-shifter and rectifier.
2003 Jrnl. Physics & Chem. Solids 64 1566/1 AC initial magnetic susceptibility was measured by ferrometer in the AC magnetic field with frequency from 0.8 to 8 kHz.
This entry has been updated (OED Third Edition, June 2014; most recently modified version published online March 2022).
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