Abstract
A SERIOUS inconvenience attaches to the standard method of testing a plane grating, echelon, or other dispersive apparatus, by crossing its dispersion with that of an auxiliary piece; for, unless the resolving power of the auxiliary dispersion is in some degree comparable with that of the piece to be tested, it is scarcely possible to identify ghosts which lie close to their primaries. When an extended research with crossed dispersions is in question, the case, in most laboratories, becomes even more difficult.
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