INDEX. 
431 
Logarithms, multiplication and division 
by, 47 
Logarithms of numbers, table of, 284- 
301; explanation, 223 
Logarithmic sines, cosines, tangents, co¬ 
tangents, secants and cosecants, table, 
302-391 ; explanation, 221-228 
Longitude, difference of, how to find from 
azimuths, 91 
Longitude, to find difference of, when de¬ 
parture and difference of latitude is 
given, 93 ; and time, observations for, 
151-203; to find the, by chronometer, 
from altitude of sun, example, 155- j 
156 ; to find, by chronometer, from j 
altitude of a star, example, 157 ; by ! 
lunar distance, remarks and examples, 
183-191; by meridian distance, 164- 
168 ; by moon culminating stars, 195- 
201 ; table for use with this method, 
222 ; by occultation of stars, including 
Major Grant’s method of predicting j. 
occultations, with diagrams, 168-182 
Lunar distance, longitude not usually 
found within ten minutes of arc by 
travellers by this method, 88; how to 
find lost date by, 151; longitude by, 
remarks and examples, 183-191 ; com¬ 
plete list of observations for, 185; 
computed by Raper’s Rigorous Method, 
186 ; example, 188; by natural co¬ 
sines, 190 
Magnetic bearing, how to reduce to the 
true, 12 
Magnetic variation, chart showing lines 
of equal, 82 
Map projections, 58-72 
Maps, blank, ruled for latitude and 
longitude, should be taken, 7 ; tables 
for constructing the graticules of, 69- 
72 ; scales of, 73 
Mapping instruments, list of, recom¬ 
mended, 5 
Mapping a country, 75-82 
Marquois’s scales, 5 
Mean time described, 150 
Measuring-tape, 5 
Mercator’s projection, rules and tables 
for constructing, 58-60 
Mercury for artificial horizon, how to 
clean, 22 
Meridian altitude of sun, latitude by, 
example, 139 ; of a star, latitude by, 
example, 141 
Meridian passage of star, how to find 
time of, 140 
Meridian passage of stars on the first day 
of the month, table of times of, 246- 
247 ; explanation, 220 ; table of correc¬ 
tions, for the days of the month, 248 ; 
explanation, 220 
Meridian, true, to find the direction of 
the, by a watch, 51 ; by the sun, 
without instruments, 52 ; by pole star, 
by high and low stars, by stars E. and 
W. on meridian, by meridian passage 
of any star, 195-196 
Meridional parts, table of, for constructing 
maps on Mercator’s projection, 59 
Meteorological Tables, Guyot’s, 7 
Meteorological charts and tables for com¬ 
puting heights by boiling-point thermo¬ 
meter and barometer, 213-214; Bar¬ 
tholomew’s Meteorological Atlas, 213 
Metres into English feet, table for con¬ 
verting, 261-265 ; explanation, 222 
! Metrical weights and measures, table 
for converting into their English 
equivalents, 283 
j Millimetres and inches, comparison of, 
table, 260 ; explanation, 222 
Molesworth’s u Pocket-Book^of Engineer¬ 
ing Formulae,” 6 
Moneys, foreign, with equivalents in 
British currency, table, 268 ; explana¬ 
tion, 222 
Moon’s altitude, to compute, example, 
193-194 
Moon’s culminating stars, longitude by, 
