Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 615
nstru-ment in the usual position. For angles; between 110 degrees and ISO degrees the Pistor & Martenss Circle. instrument is inverted, and the graduationbegins at a new point about GO degrees farther along the limb, readingin a direction opposite to the first. Where the angle approaches… … EEFLECTING INSTRUMENTS SEXTANTS. 599 LAURENTS SEXTANT FOR STELLAR OBSERVATIONS. Another modification of the sextant deserving of attention was exhibited by Captain Albert Laurent, formerly of the French naval service,and at present commander of the transatlantic steamer ImperatriceEugenie. Captain…
Machinery · Scientific apparatus and instruments
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