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Published online by Cambridge University Press: 17 January 2013
In the preceding paper I have described the bands produced by gratings or grooved surfaces with 500 divisions in an inch, when the two grooved surfaces are in contact, and the grooves in the one slightly inclined to those in the other.
The following results were obtained with two gratings, one of wrhich had 2000 and the other 1000 divisions in an inch.
1. When the surfaces are in perfect contact, and the grooves parallel, very irregular bands are seen on the united surfaces, either with a lens or by ordinary vision, and are parallel to the grooves. They are seen only on the 2d, 4th, 6th, &c., spectra on each side of the luminous bar or disc.
page 230 note * These bands are not seen on a beautiful Munich grating, kindly lent me by Professor Stokes, having 3750 divisions in an inch. As the bands become smaller with the thickness of the glass, their absence in this grating arises doubtless from its great thickness, which is 0·158 of an inch, the thickness of the gratings upon which they appear being about 0·04.