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- W2021653095 abstract "For the past several years the circles used in the theodolites of the United States Coast and Geodetic Survey have been graduated by the National Bureau of Standards. After being graduated, these circles have been thoroughly tested at the Bureau of Standards and found to have the necessary precision. However, after the circles have been placed in instruments and used in the field the apparent positions of the graduations as seen in the micrometer have sometimes changed. This may be due to a lack of parallelism between the plane of the circle and the plane of the micrometers, to a warping of the circle so that it no longer is an optical flat, or to the metal itself flowing with age. This present discussion considers only the apparent position of the graduations as observed by micrometers with the circle in its normal position in the theodolite." @default.
- W2021653095 created "2016-06-24" @default.
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- W2021653095 date "1940-01-01" @default.
- W2021653095 modified "2023-10-16" @default.
- W2021653095 title "Analysis of circle-graduation errors" @default.
- W2021653095 doi "https://doi.org/10.1029/tr021i002p00207" @default.
- W2021653095 hasPublicationYear "1940" @default.
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