Altazimuth Theodolite

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“An altazimuth theodolite of an improved pattern now used on the Ordnance Survey. The horizontal circle of 14 inches diameter is read by three micrometer microscopes; the vertical circle has a diameter of 12 inches, and is read by two microscopes.” — Encyclopedia Britannica, 1893


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


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