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Updated: June 8, 2025
One plate, for example, gave a yellow colour, another a blue colour, and the two together a deep purple, but as plates which produced this colour were always less than the twelve-thousandth part of an inch thick it was quite impracticable, by any contrivance yet discovered, to measure their thickness, and determine the law according to which the colours varied with the thickness of the film.
He arrived at the place where Colonel Colby is measuring the base line, just at the time when they had completed the repetition of the operation; and he saw, by the instrument, which had not been raised from the spot, that the accuracy of the repetition was within half a dot the twelve-thousandth part of an inch. Mr. Herschel has travelled on the Continent.
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