An Account of a Method of Dividing Astronomical and other Instruments, by Ocular Inspection; in which the usual Tools for graduating are not employed; the whole operation being so contrived, that no error can occur but what is chargeable to vision, when assisted by the best optical means of viewing and measuring minute quantities. - With 2 Tables of real Errors and 7 original engravings.
Troughton, Edward.:
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