fluorometern.

1892 L. M. Dennis tr. O. W. F. Oettel in tr. W. Hempel Methods Gas Anal. v. 317 The apparatus employed, for which the author proposes the name Fluorometer, is made completely of glass, all rubber and cork connections which might cause error being avoided.

1909 Jrnl. Amer. Chem. Soc. 31 785 Quantitative liberation of the nitrogen of the hydrazine consequently takes place... The method may be employed in the determination either of hydrazine or of copper. In either case the Hempel-Oettel fluorometer is employed.

1913 J. W. Mellor Treat. Quantitative Inorg. Anal. 646 Oettel, and Hempel and Schleffler, have devised special instruments—called fluorometers—for this purpose.

1897 N.Y. Tribune 9 Feb. 3/4 In a series of scientific experiments with the new fluorometer, invented by John Dennis of this city [sc. Rochester], Professor A. L. Arey demonstrated definitely the angles and direction of the Roentgen rays with regard to their source.

1898 Sci. Amer. 12 Feb. 101/1 It is the province of the ‘fluorometer’ to enable observers to form an exact and certain diagnosis of the presence of bullets, needles, calculi or any other substance which is comparatively more dense in its fluoroscopic shadow than the subject in which it is contained.

1899 D. Walsh Röntgen Rays in Med. Work (ed. 2) 97 In America the ‘Dennis Fluorometer’ is in vogue.

1918 Amer. Jrnl. Roentgenol. 5 114/1 The Dennis fluorometer, consisting of an upright grid or ladder attached to the table, was used frequently in the Spanish American War.

1967 Jrnl. Hist. Med. 22 (fig. facing p. 175) First osteopathic x-ray installation (1898)... The cadaver..lies on the Dennis Fluorometer, an x-ray table and localization device.

1913 Chem. Abstr. 7 2905 The principle involved in the instrument described, termed a fluorometer, consists in passing a filtered beam of light from a normal lamp into a rectangular quartz vessel filled with fluorescent material, thus producing a narrow fluorescent beam in the quartz vessel.

1942 Electronic Engin. 15 127 A supersonic cell fluorometer..for the measurement of the rise and decay of luminescence in phosphors.

1951 Science 6 July 13/1 After standing for 30 min..fluorescences are measured, comparing with the blank by the use of a fluorometer or by titration.

1989 Molecular & Cellular Probes 3 377 The generation of fluorescent 4-methylumbelliferone by the enzymatic reaction was measured in a microplate fluorometer.

2010 Nature 5 Aug. 680/1 A fluorometer scanned the water with a narrow beam of light that would cause any dissolved oil to fluoresce at a telltale wavelength.