un 



INDEX TO VOL. I. 



[jfAVIOATIOJf, WO. 



SECTION XI. NAVIGATION AND NAUTICAL ASTRONOMY. 



Aecocvr by latitude and longitude de- 



find, IO&I. 



Altitude, uppircnt nd obaerred, 1076. 

 Altitude, meridian, of the ran, 1086. 

 Altitude, observed and corrrrtrd. 1977. 

 Altitude of celestial body. 1074. 

 Altitude of celestial object, to deter- 



mine with text error (for longitude), 



il..-, 1093. 

 Altitude* t sea, examples of correction! 



f.r. 1078. 



Altitude*, double, problem of. 1086. 

 Altitude*, equal, equation of, 1096. 

 Altitude*, to compute, 1103. 

 Amplitude, 1074. 

 Amplitude, lining. 1074. 

 Amplitude, vetting, 1074. 

 Angular diitance* of heavenly bodies, 1073. 

 Apparent time, 1075. 

 Artificial horizon, the, 1086. 

 AHcnrion, right, 1075. 

 Astronomical instrument-making, refine- 

 ment* of, 1112. 

 Astronomical phenomena and navigation, 



1073. 



Astronomical time, 1075. 

 ASTRONOMY, NAUTICAL, 1070. 

 Astronomy, nautical, definition of terms 



in, 1073. 



Axis of the earth. 1049. 

 Axis of the heavens, 1074. 

 Aximnth, 1074. 



Crlestial latitude, 1075. 



Celestial longitude, 1074. 



Celestial meridians, 1074. 



Charts, plane, and Mercator's, 1115. 



Chronometer, error of a, 1097. 



Chronometer, example* of obtaining the 



longitude by a, 1093. 

 Chronometer, mean dailj rate of a, 1097. 

 Chronometer, to find the longitude by a, 



1097. 



Chronometer, to find the rate of a, 1097. 

 Chronometers, correction for, 1097. 

 Chronometers, history and construction of, 



1092. 



Chronometers, management of, 1097. 

 Circles of declination, 1074. 

 Compass, deviation of the, 1090. 

 Compass, point* of the, 1051. 

 Compass, the mariner'*, 1050. 

 Compass, to find the variation of the, by 



an amplitude, 1090. 

 Compass, to find the variation of the, by 



an azimuth, 1091. 



Compass, variation of the, 1050, 1090. 

 Compasses, derangement of, through in- 

 ductive action of iron vessels, 1119. . 

 Compound courses, or traverse-nailing, 



1055. 

 Corrections for altitudes of celestial bodies, 



1076. 



Corrections for parallax, 1077. 

 Corrections for refraction, 1076. 

 Corrections, instrumental, 1097. 

 (ountrr. current* in the Mediterranean, 



1067. 



Courses, definition of a ship's, 1050. 

 Current, drift of s, 1066. 

 Current, learning the set and drift of a, 



MM 



Currmt-Milini, example* in, 1066. 

 Current, set o? a, 1CH56. 

 Current, vrlonty of a, 1066. 

 Currents, tub. marine or under, 1066. 



DAT, lunar and solar, Ac., 1075. 



Day's work, nv-aning of the term, 1051, 



1115. 

 Dead-reckoning, IO&I, 1115. 



Drclinatinn. 1074. 



l>,-tinitions in navigation, 1019. 



Departure, definition of the term, 1052. 



i of the compass, 1090. 

 Difference of latitude and departure, 



tables of, 1068. 1069. 

 Difference of latitude in plane sailing, 



1052. 



Dip of the hoi-iron, 1076. 

 Distance in plane sailing, 1052. 

 l)i<tnnces, lunar, 1093. 

 Division by logarithms, 1(137- 

 Double altitudes, problem of, 1086. 

 Drift of a current, 1066. 



EARTH, figure of the, 1049. 



Earth. Foucault's illustration of the ro- 

 tation of the, 1070. 



Earth, proofs of the rotation of the, 1070. 



Earth, rotation of, on an axis, 1049. 



Earth, rotundity of the, 1070. 



Ecliptic, the, 1074. 



Kquation of equal altitudes, 1096. 



Equation of time, 1075. 



Equator of the earth, 1049. 



Equinoctial points, 1074. 



Kquinortial, the, 1074. 



Equinox, autumnal, 1074. 



Equinox, vernal, 1074. 



Error, the index, of the sextant, 1077, 

 1112, 1114. 



Evolution by logarithms, 1037. 



Extraction of roots by logarithms, 1037. 



FALLING bodies, and the pendulum ex- 

 periment, 1073. 



Figure of the earth, 1048. 



Foucault's pendulum experiment, illus- 

 trating the rotation of the earth, 1070. 



GRAVITATION, the law of, 1070. 

 Great circle-sailing, principles of, 1067. 

 Greenwich mean time, to obtain at sea, 



1105. 

 Gunter's scale, 1054. 



HORIZON, artificial, the, 1036. 

 Horizon, dip of the, 1076. 

 Horizon, nature of the, 1050. 

 Horizon, the rational, 1050. 

 Horizon, the sensible, 1050. 

 Hour-angle, 1075. 



INDEX-ERROR of the sextant, 1077,1112, 

 1114. 



Index of a logarithm, 1037. 



Instruments, difficulties in the construc- 

 tion of, 1112. 



Instruments, nautical, 1111. 



Invention of the sextant, 1115. 



Involution of powers by logarithms, 1037. 



Iron vessels, magnetism of, 1118. 



JOURNAL, ship or sea, how to keep the, 

 1115. 



Journal, specimen page of a ship's, 1116. 



Jupiter's satellites, occultations and 

 eclipses of, used in obtaining the lon- 

 gitude, 1111. 



KNOT, definition of the term, 1050. 



LATITDDS and departure, tables of dif- 

 ference of, 1068. 1069. 



latitude at sea, from the sun above the 

 pole, 1079. 



Latitude at sea, obtained from a meridian 

 altitude, 1078. 



Latitude, celestiiil, 1075. 



Latitude, definition of, 1019. 



Latitude from a star above the po.e, 1080. 



Latitude from a stnr, above the pole, 

 rules and examples of obtaining the, 

 1081. 



Latitude from a star, below the pole. 



Latitude from an altitude rvir the meri- 

 dian, the declination, hour-angle, and 



latitude by account. 1 ' 

 Latitude from the altitude of two fixed 



tars, observed at the same time, 



IOM. 

 Latitude from the declination, altitude, 



and hour-angle. 1084. 

 Latitude from the moon, above the pole, 



1081. 

 Latitude from the moon, above the pole, 



examples of obtaining the, 1082. 

 Latitude from the moon, below the pole, 



1083. 

 Latitude from the sun, above the pole. 



examples of obtaining the, 1079. 

 Latitude from the sun, below the pole, 



1083. 

 Latitude from two altitudes of the sun, 



and the time between the observations, 



1036. 



Leeway, meaning of the, term, 1050. 

 Local time, to find, 1093. 

 Logarithmic differences for lunar distances, 



1100. 



Logarithmic tables, construction of, 1036. 

 Logarithmic tables, method of usiiu;, 



1036. 

 Logarithmic trigonometrical tables (for 



the tables themselves, see page 666, el 



teg.), 1038. 

 Logarithms, explanation of the nature of, 



1036. 

 Logarithms, proportional and lunar dis- 



t. inres, 1105. 



Log-board, use of the, 1051. 

 Log-book, use of the, 1051. 

 Log, use of the, 1050. 

 Longitude at sea, to find the, 1092. 

 Longitude at sea, to find the, by lunar 



observations, 1098. 

 Longitude, celestial, 1074. 

 Longitude, celestial, measured from Aries, 



1074. 



Longitude, celestial, measured on the eclip- 

 tic, 1074. 

 Longitude, celestial, reckoned to 360', 



1074. 



Longitude, definition of, 1049. 

 Longitude, effect on, by error in the lunar 



distance, 1104. 



Longitude from lunar observations, exam- 

 ples of different methods of finding the, 



11061111. 

 Longituilt- from lunar observations, to 



find the, 1104. 

 Longitude obtained by the distances of the 



planets, fee., 1111. 

 Longitude obtained by the eclipses, &c., 



of Jupiter's satellites, 1111. 

 Longitude, to find the, by a chronometer, 



1097. 



Loxodromic curve, nature of the, 1064. 

 Lunar distance, formula for clearing the, 



1099. 

 Lunar distance, rule for clearing the, 



1100. 



Lunar distances, 1093. 

 Lunar distances, examples of clearing, 



1103. 



Lunar distance*, how to observe by a sex- 

 tant, 1114. 

 Lunar distance*, logarithmic differences 



for, 11(10. 

 Lining dimmers, precautions to be taken 



in making, 1 104. 



