Grat"ing (?), n. (Optics) A
system of close equidistant parallel lines or bars, esp. lines ruled
on a polished surface, used for producing spectra by diffraction.
Gratings have been made with over 40,000 such lines to the inch, but
those with a somewhat smaller number give the best
definition.
Grat"ing (?), n. [See 2d Grate.]
1. A partition, covering, or frame of parallel
or cross bars; a latticework resembling a window grate; as, the
grating of a prison or convent.
2. (Optics) A system of close
equidistant and parallel lines lines or bars, especially lines ruled
on a polished surface, used for producing spectra by diffraction; --
called also diffraction grating.
3. pl. (Naut.) The strong
wooden lattice used to cover a hatch, admitting light and air; also,
a movable Lattice used for the flooring of boats.
[1913 Webster]
Grat"ing, a. [See Grate to rub
harshy.] That grates; making a harsh sound; harsh. --
Grat"ing*ly, adv.
Grat"ing, n. A harsh sound caused
by attrition.
Grat"ing (?), n. (Optics) A
system of close equidistant parallel lines or bars, esp. lines ruled
on a polished surface, used for producing spectra by diffraction.
Gratings have been made with over 40,000 such lines to the inch, but
those with a somewhat smaller number give the best
definition.
