Assuming that the observ- his intention on his next, the twenty-first, er is placed at O, his celestial horizon will march. After a few hours' sleep good go- be H E 8 W. The axis of the heavens ing was found, and twenty miles were cov- will be P p, P being the elevated pole, ered on the… … Diagram showing the principle of the sextant and the manner of its use in determining the altitudes Of celestial bodies. HOW COOK HADE HIS LATITUDE OBSERVATIONS.
Apparatus · Pole · Patents · Munn · North Pole · Scientific American · Sheet metal · Producer gas · Latin America · Gas engines · Horizontal rudder · Triple action · Hot water · Practical treatise
Internet Archive · Public domain (published before 1931). Free to use for anything.
![An illustration from Perspectiva; hierinnen auffs kürtzte beschrieben, mit Exempeln eröffnet vnd an Tag gegeben wird, ein newer besonder kurtzer, doch gerechter vnnd sehr leichter Weg, wie allerley Ding, es seyen Corpora, Gebew, oder was möglich zuerdencken vnd in Grund zulegen ist, verruckt oder vnuerruckt, frener in die Perspectyf gebracht werden mag, on einige vergebliche Linie, riss vñ Puncten, [et]c. dergleichen Weg bisshero noch nit bekant gewesen (1571)](https://img.insideoutlibrary.com/img/200/ia-perspectivahieri00lenc-12-10.webp)
