rheoscopen.
/ˈriːəskəʊp/, U.S. /ˈriəˌskoʊp/ 1. An instrument for detecting the existence of an electric current; a means of detecting a current. Now historical and rare.In Wheatstone's nomenclature the rheoscope differed from rheometer n. 1 by merely detecting a current, rather than detecting and measuring it.
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the world > matter > physics > electromagnetic radiation > electricity > electric current > [noun] > instrument determining existence of current
rheoscope1843
1843 C. Wheatstone in Philos. Trans. (Royal Soc.) 133 307 A Rheoscope is an instrument for ascertaining merely the existence of an electric current.
1852 D. Lardner Hand-bk. Nat. Philos. & Astron. II. ii. 380 Reoscopes and Reometers.
1906 J. Loeb Dynamics Living Matter iv. 68 The nerve-muscle combination..acts as a sensitive rheoscope.
1990 G. E. Burch et al. Hist. Electrocardiogr. (new ed.) 264 Meisner and Cohn registered electric impulses from the frog's heart with a rheoscope.
2. Physics. An instrument for observing the effects of shear on particles, esp. red blood cells.
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1969 H. Schmid-Schönbein & R. Wells in Science 18 July 289/1 A transparent cone plate viscometer (rheoscope)..allowed the direct microscopic study of the influence of shear upon the individual erythrocytes.
1984 Internat. Jrnl. Multiphase Flow 10 156 The stationary orientation motion of RBCs..observed in an extremely narrow cone-plate ‘rheoscope’.
2007 Carbohydrate Polymers 68 495 Phase transition [of starch granules] under shear conditions was investigated using a rheoscope—a controlled rate/controlled stress rheometer with a built-in high-resolution video camera.
This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).
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