See Also: Rowland(dictionary)

Rowland (iou)



Rowland noun. E20.
[H. A. Rowland (1848-1901), US physicist.]
Physics. Used attrib. and in possess. to designate devices and concepts associated with Rowland.
Rowland circle a circle on which must lie the slit, (concave) grating, and photographic plate of a spectrograph if all the spectral lines are to be brought to a focus on the plate. Rowland ghost a spurious spectral line produced by a periodic error in the spacing of the lines of a diffraction grating (usu. in pl.). Rowland grating a concave diffraction grating ruled on a machine designed by Rowland. Rowland mounting a device for holding a camera and a diffraction grating, which are connected by a bar forming a diameter of the Rowland circle. Rowland ring a torus made of a magnetic material whose properties it is wished to investigate and linked with a coil of current-carrying wire. Rowland's circle = Rowland circle above. Rowland's mounting = Rowland mounting above.