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150:. The surface in the left photo is nearly flat, indicated by a pattern of almost straight parallel interference fringes at equal intervals. The surface in the right photo is uneven, resulting in a pattern of curved fringes. Each pair of adjacent fringes represents a difference in surface elevation of half a
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testing the flatness of surfaces, showing the different patterns of interference fringes. The flats are resting with their bottom surfaces in contact with the surface to be tested (toolmaker's flats) and they are illuminated by a monochromatic light source. When there is a slight gap between the
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383:{{Information |Description={{en|Photos of two glass optical flats testing the flatness of surfaces, showing the different patterns of interference fringes. The flats are resting with their bottom surfaces in contact with toolmaker's flats. When there is
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for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and
Switzerland. The creator and year of publication are essential information and must be provided. See
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of the light used, so differences in elevation can be measured by counting the fringes. The flatness of surfaces can be measured to millionths of an inch by this method.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
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two surfaces, the light waves reflected from both surfaces interfere, resulting in a pattern of bright and dark bands called an
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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The following pages on the
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occurred prior to
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183:, Vol. 26, April, 1920, The Industrial Press, New York, p. 706, fig. 21 & 22
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Click on a date/time to view the file as it appeared at that time.
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Franklin D. Jones "How precision gage-blocks are made" in
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Public domain in USA - published prior to 1923 in USA
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Commons is a freely licensed media file repository.
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
