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 |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 31.
Σελίδα 5
... glass . D CHA P. II . DEFINITIONS , PRINCIPLES , & C . AY and Night arife from the circumrotation of the Earth . That imaginary line about which the rotation is performed is called the Axis , and its extremities are called POLES . That ...
... glass . D CHA P. II . DEFINITIONS , PRINCIPLES , & C . AY and Night arife from the circumrotation of the Earth . That imaginary line about which the rotation is performed is called the Axis , and its extremities are called POLES . That ...
Σελίδα 27
... glass is to reflect the image of the obferved object , either to the fore or back horizon glass , and from thence to the eye of the obferver . This glass is set in a brass frame , and is placed perpendicular to the plane of the ...
... glass is to reflect the image of the obferved object , either to the fore or back horizon glass , and from thence to the eye of the obferver . This glass is set in a brass frame , and is placed perpendicular to the plane of the ...
Σελίδα 28
... glass are two funk screws , one on each fide of the glass , so that by fcrewing up the one , and unfcrewing the other , the glafs may be fet perpendicular to the plane of the inftrument . The lower part of the fore horizon glafs is ...
... glass are two funk screws , one on each fide of the glass , so that by fcrewing up the one , and unfcrewing the other , the glafs may be fet perpendicular to the plane of the inftrument . The lower part of the fore horizon glafs is ...
Σελίδα 29
... glass to which it belongs . Fig . 6. reprefents the quadrant , wherein DB , CD , are the two radii or fides ; BC the limb ; P , Q , the braces ; DV the index move- able about the center D , upon which is the index glafs A ; and at the ...
... glass to which it belongs . Fig . 6. reprefents the quadrant , wherein DB , CD , are the two radii or fides ; BC the limb ; P , Q , the braces ; DV the index move- able about the center D , upon which is the index glafs A ; and at the ...
Σελίδα 30
... glass will be perpendicular to the plane of the quadrant . ADJUSTMENT III . To fet the fore horizon glass parallel to the index glass , the index being at Zero . Hold the plane of the quadrant in a vertical position , with the arch ...
... glass will be perpendicular to the plane of the quadrant . ADJUSTMENT III . To fet the fore horizon glass parallel to the index glass , the index being at Zero . Hold the plane of the quadrant in a vertical position , with the arch ...
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