ASTKONOM Y METEOROLOGY. ] 



INDEX TO VOL. I. 



1251 



Lunar distances, various methods of clear- 

 ing, 1101. 



Lunar observations, 1093. 



Lunar observations, examples of obtain- 

 ing the longitude at sea by, 1 106, et seq. 



Lunar observations, how to make, 1101. 



Lunar observations, to find the longitude 

 at sea by, 1098. 



MAGNETIC amplitude and azimuth, 1090. 



Magnetism induced in iron vessels, 1118. 



Magnetism of iron vessels, 1118. 



Magnetism, retentive, Scoresby's defini- 

 tion of, 1119. 



Mantissa of a logarithm, 1037. 



Maury's wind and current charts, 1068. 



Mean time, 1075. 



Mean time at Greenwich, to obtain at sea 

 the, 1 105. 



Mediterranean, counter-currents of the, 

 1067. 



Mercator's method, discovery of, 1062. 



Mercator's sailing, 1060. 



Mercator's sailing, examples in, 1062. 



Mercator's sailing, theory of, 1061. 



Meridian altitude of the sun, 1086. 



Meridians, 1074. 



Meridians of longitude, 1049. 



lional difference of latitude, 1061. 



inal parts, construction of tables 

 of, 1064. 



ml parts, definitions of, 1061. 



.Mtn.iional parts, table of, 1062. 



Middle latitude, construction of table for 

 correcting, 1063. 



atitude mailing, 1057. 

 atiiude sailing, examples in, 1058. 

 atitude sailing, rules for, 1058. 

 atitude sailing, theory of, 10JS. 



Middle 



Middle 



Middle 



Middle 



Middle atitude. Workman's table of cor- 

 rections for, 1060. 



Moon's transit, table of times of the, and 

 daily variation, 1081. 



Multiplication by logarithms, 1037. 



NADIR and zenith, 1074. 

 NAUTICAL ASTRONOMY, 1070. 

 Nautical instruments, 1111. 

 Nautical mile, length of the, 1050. 

 NAVIGATION, 1048. 

 Navigation, uses of the art of, 1035. 



OBLIQUE-ANGLED triangles, solution of, 



1043. 

 Oblique sailing, taking departures in, 



1067. 



Obliquity of the ecliptic, i074. 

 Observations by the quadrant or sextant, 



bow to make, 1113. 

 Observations, lunar, 1093. 



PARALLAX, 1077. 



Parallax, horizontal and in altitude, 1077. 



Parallel sailing, 1U50. 



Parallel sailing, examples in, 1057. 



Parallels of declination, 1U74. 



Parallels of latitude, 1049. 



Passages shortened by Great Circle sail- 

 ing, 1067. 



Pendulum experiment, and falling bodies, 

 1073. 



Pendulum experiment, Foucault's, 1072. 



Pendulum experiment, mathematical prin- 

 ciples of Foucault's, 1072. 



Pendulum, the, and the earth's rotation, 

 1071. 



Plane sailing, examples in, 1052. 



Plane sailing, principles of, 1051. 



Plane sailing, proportions in, 1052. 



Points, equinoctial, 1074. 



Points of the compass, 1051. 



Poles of the earth, 1049. 



Prime vertical, the, 1074. 



Proportional logarithms and lunar dis- 

 tances, 1105. 



Proportions in plane sailing, 1052. 



QUADRANT, the, 1111. 

 Quadrant, use of the, 1113. 



RATE of sailing, 1050. 



Ratios, trigonometrical, 1038. 



Reckoning, civil and astronomical, 1075. 



Refraction of the heavenly bodies, 1076. 



Rhumb-line, definition of the term, 1035, 

 1051. 



Rhumb-line, the continued, 1064. 



Right-angled triangles, solution of, 1039. 



Right ascension, 1075. 



Rotation of the earth, Foucault's experi- 

 ment on the, 1071. 



Rotation of the earth on an axis, 1019. 



nutation of the earth, proofs of the, 1070. 



Rotation of the earth, time required for 

 a, 1049. 



Rotundity of the earth, how proved, 1070. 



SAILING in currents, 1066. 



Sailing, rate of, 1050. 



Scoresby on the magnetism of iron ves- 

 sels, 1118. 



Secants, cosecants, &c., 1037. 



Secondary circles to the horizon, equinoc- 

 tial, and ecliptic, 1075. 



Semi-diameter of the sun, moon, &c.,1076. 



Set of a current, 1066. 



Sextant, 1111. 



Sextant, invention of the, 1115. 



Sextant, use of the, 1113. 



Ship's journal, how to keep the, 11 J5. 



Sidereal time, 1075. 



Signs of the zodiac, 1075. 



Sines, cosines, &c., 1037. 



Single courses, examples in, 1054. 



Solar day, the, 1075. 



Solution of oblique-angled triangles, 1013. 



Solution of plane triangles, 1039. 



Solution of right-angled triangles, 1039. 



TABLE for correcting middle latitude, to 

 construct a, 1063. 



Table of difference of latitude and de- 

 parture, 1068, 1069. 



Table of meridional parts, construction of 

 a, 1064. 



Tables of sines, cosines, &c. (for the tables 

 themselves, see p. 666, et *ey.), 1038. 



Tangents, cotangents, &c., 1037. 



Tayleur, loss of the ship, owing to the 

 derangement of her compasses, 1119. 



Time, apparent, mean, sidereal, &c., 

 1075. 



Time at sea, deduced from a single alti- 

 tude, 1094. 



Time at sea, examples of obtaining the, 

 1096. 



Time at sea, to find, 1093. 



Time deduced from a star, 1095. 



Time deduced from equal altitudes, 1096. 



Time deduced from the sun, 1094. 



Time, local, to find, 1093. 



Transit of the moon, table of, 1081. 



Traverses by mid-latitude and Mercator, 

 1064. 



Traverse-sailing, examples in, 1056. 



Traverse-sailing, mid-latitude and Mer- 

 cator, examples in, 1065. 



Traverse-sailing, or compound courses, 

 1055. 



Traverse-sailing tables, specimens of, 

 1117. 



Traverse-table (see also pages 1068 and 

 1069), 1053. 



Traverse, working or resolving a, 1055. 



Triangle, solution of plane, lll.U. 



Triangles, examples in solving plane, 

 1047. 



Triangles, oblique-angled, solution of, 

 1043. 



Triangles, ratio of the sides and angles of 

 plane, 1038. 



Triangles, right-angled, solution of, 1039. 



Trigonometrical ratios, 1038. 



Trigonometrical terms explained, 1037. 



Trigonometry, plane, use of in navigation, 

 1035. 



USE of trigonometrical tables, 1038. 



VARIATION of the compass, 1050, 1090. 



Velocity of a current, 1066. 



Vernier on the sextant, &c., how to use 



the, 1114. 



Vernier, pricciplcs of the Vernier, 1114. 

 Vertical circles, 107 I. 

 Vertical, the prime, 1074. 



WORKMAN'S table for corrections of mid- 

 dle latitude sailing, 1UOO. 



ZENITH and Nadir, 1074. 

 Zenith distance, 1074. 

 Zodiac, the, 1075. 



SECTION XII. METEOROLOGY. 



ABSORPTION and radiation, gaseous, 1191. 

 Actinic force, Glauber's observations on 



the, lll. 



Aitiniimeter, the, 1164. 

 Aerolites, 1153. 



African!!, their climate, habits, &(.., 1201. 

 Agriculture and meteorology, 1186. 

 Ague, cause of, 1186. 

 Air, blue colour of moist, 1178. 

 Air, clearness of , at great elevations, 1184. 

 Air, mean pressure of dry, 1 169. 

 Air, specific gravity of, IIUJ. 

 Air, weighing of, :' 

 Air, weight of a cubic foot of, 1169. 



Air, weight of vapour in a cubic foot of, 

 1168. 



Alps, elevation of the snow-line on tlir, 

 1193. 



Altitude influences the climatic zone, 

 1199. 



Altitudes, tables of, for the barometer, 11 S3. 



Andes, elevation of the snow-line on the, 

 1193. 



Anemometers, 1170. 



Anemometers, various, 1161. 



Aneroid and mercurial barometers, com- 

 parative readings of, during a uulluon 

 ascent, 1214. 



Aneroid barometers, 1126. 

 Animals, acclimatisation of, 1201. 

 Animals and plants, their distribution in 



respect to climate, 1199. 

 Aqueous vapour, power of, in absorbing 



heat, 1192. 



Aqueous vapour, specific gravity of, 1120. 

 Aqueous vapour, suspended in the air, 



1183. 

 Ararat, elevation of the snow-line oa 



Mount, 1193. 

 Ascents by GlaUher in the balloon, 1180, 



et eq. 

 Atmosphere, absorbing power of the, 11 92. 



