Abstract
The divided object glass micrometer, as happily applied by the late Mr. John Dollond to the object end of a reflecting telescope, and now with equal advantage adapted by the present Mr. Dollond, his son, to the end of an achromatic telescope, is so easy to use, and affords so large a scale, that it is generally looked upon by astronomers as the most convenient and exact instrument for measuring small distances in the heavens.
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