Century Dictionary and Cyclopedia
- n. A machine for ruling diffraction gratings. The ruling is performed by a fine diamond-point, the spacing of the lines being accomplished by the most refined micrometer-screw mechanism. (See
grating, 2, and micrometer.) The new ruling-engine at Johns Hopkins University has produced gratings ruled with from 10,000 to 20,000 lines per inch, 6 inches in diameter, with faces formed on a radius of more than 21 feet, and having better definition than any ever before made. Such engines must be placed in as nearly equable a temperature as can be attained, as any sensible expansion or contraction during their operation defeats their purpose.
“Other projects tackled by Siegbahn and his staff include the construction of an electron microscope of a new pattern and an automatically working ruling-engine for scratching well-defined gratings (with up to 1,800 lines per mm), especially for X-rays and the extreme ultraviolet field.”
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