The Theory and Practice of Finding the Longitude at Sea Or Land: To which are Added, Various Methods of Determining the Latitude of a Place, and Variation of the Compass; with New Tables. By Andrew Mackay, ...J. Sewell, P. Elmsly, and J. Evans, 1793 |
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Σελίδα 7
... altitude is corrected for the depreffion of the Horizon , and the er- rors arifing from the inftrument , it is called the Apparent Altitude ; and when reduced to the true Horizon , it is called the True Altitude ; altitudes are ...
... altitude is corrected for the depreffion of the Horizon , and the er- rors arifing from the inftrument , it is called the Apparent Altitude ; and when reduced to the true Horizon , it is called the True Altitude ; altitudes are ...
Σελίδα 24
... altitude by means of the oppofite part of the horizon . The inftruments in ufe for measuring altitudes at fea , previous to the invention of Hadley's Quadrant , were , the Crofs Staff and Davis ' Quadrant . The advantages poffeffed by ...
... altitude by means of the oppofite part of the horizon . The inftruments in ufe for measuring altitudes at fea , previous to the invention of Hadley's Quadrant , were , the Crofs Staff and Davis ' Quadrant . The advantages poffeffed by ...
Σελίδα 33
... Altitudes at Sea . The altitude of any object is determined by the pofition of the index on the limb , when by reflection that object appears to be in the ho- rizon . In obferving altitudes , it will be found moft convenient tohold the ...
... Altitudes at Sea . The altitude of any object is determined by the pofition of the index on the limb , when by reflection that object appears to be in the ho- rizon . In obferving altitudes , it will be found moft convenient tohold the ...
Σελίδα 34
... altitude above the vifible horizon will be properly obferved . It is often found , in meafuring the altitude of any object , or the distance between two fixed objects , that a different angle * will be obtained , by finishing the ...
... altitude above the vifible horizon will be properly obferved . It is often found , in meafuring the altitude of any object , or the distance between two fixed objects , that a different angle * will be obtained , by finishing the ...
Σελίδα 35
... altitude of the ftar . When the horizon , under the object whofe altitude is intended to be obferved , is obfcured or rendered imperfect , by fog or any other impediment , the back obfervation becomes neceffary ; we would , however ...
... altitude of the ftar . When the horizon , under the object whofe altitude is intended to be obferved , is obfcured or rendered imperfect , by fog or any other impediment , the back obfervation becomes neceffary ; we would , however ...
Άλλες εκδόσεις - Προβολή όλων
The Theory and Practice of Finding the Longitude at Sea Or Land: To Which ... Andrew MacKay Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
The Theory And Practice Of Finding The Longitude At Sea Or Land Andrew MacKay Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
Συχνά εμφανιζόμενοι όροι και φράσεις
Aberdeen add the log adjuſtment alfo alſo anfwering angle apparent altitude apparent diſtance arc fecond arc firft arch Arcturus arifing azimuth becauſe cafe co-fecant co-fine co-tangent Co-verfed computing correction correfponding courſe degrees Diff dift divifion Earth ecliptic emerfion equal altitudes equation error fame fecant feen femidiameter fextant fhip fhould figns fince finding the Longitude firſt Fixed Star folar ftar fubtract given glaſs greateſt Greenwich half Hence horizon glafs horizontal parallax increaſe inftrument interfection interval laſt latitude lefs limb logarithm mean meaſured meridian method Moon moſt motion muſt Nautical Almanac neareſt neceffary nonagefimal noon obferved altitude object Obliq paffing place of obfervation planet pofition purpoſe quadrant reduced Reduced latitude refraction Rifing ſhip ſtar Sun's right afcenfion tangent teleſcope thefe theſe tion tranfit true altitude true diſtance true longitude tude uſed variation Verfed Verfed fine watch weft zenith diſtance ΙΟ