Akademik

Illuminating device; source of light. SEE ALSO: light.

- annealing l. an alcohol l. with a soot-free flame used in dentistry to drive off the protective NH₃ gas coating from the surface of cohesive gold foil.

- Edridge-Green l. a lantern used to test recognition of colored signals; it displays a single light with color filters in rotating disks that can be modified to simulate conditions of weather and atmosphere. This test for color blindness was officially adopted in Great Britain in 1915 in place of the Holmgren wool test, but is now seldom used.

- heat l. a l. that emits infrared light and produces heat; used to apply topical heat to the skin.

- mercury vapor l. a l. in which the electric arc is in an ionized mercury vapor atmosphere; it produces ultraviolet light that can be used therapeutically or in diagnostic photometry.

- mignon l. a minute electric light used in various endoscopic instruments.

- slit l. a combination of a microscope and a narrow beam of collimated light, used to examine the eye.

- spirit l. a l., used mainly for heating in laboratory work, in which alcohol is burned.

- tungsten arc l. a l. having highly compressed tungsten elements.

- ultraviolet l. a l. that emits rays in the ultraviolet band of the spectrum. SEE ALSO: ultraviolet.

- Wood l. an ultraviolet l. with a nickel oxide filter that only passes light with a maximal wavelength of about 3660 Å; used to detect by fluorescence hairs infected Microsporum audouinii, M. canis, var. distortum, or M. ferrugineum, producing greenish-yellow fluorescence.

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lamp 'lamp n any of various devices for producing light or heat see KROMAYER LAMP, SLIT LAMP