430 
INDEX. 
by angles of elevation, 55 ; measured by 
aneroid, rough rule for computing, 79 ; 
formula for computing when using 
photographic surveying camera, 131; 
determination of, by boiling - point 
thermometer, example and tables, 
209—213; by barometer or aneroid, 
example and tables, 214-218 
Heights and distances with a sextant, 
table for ascertaining, 84 
Horizon, sea, table giving the distance of 
the, uncorrected for effects of refrac¬ 
tion, 253; explanation, 221 
Horizontal limb of transit theodolite, 
adjustment of, 29 
Horizontality of the axis of the telescope, 
adjustment for, 30 
Hypsometrical apparatus, description of, 
with illustration, method of using, 13 ; 
determination of heights by, example 
and tables, 209-214 
Illuminating wires in transit theo¬ 
dolite, 27 
Inches and tenths into millimetres, con¬ 
version of, table, 260; explanation, 
222 
Index error of sextant, how to find, 19 
Index of a logarithm, how to find, 224 
India-rubber, 6 
Indian-ink, for mapping, 6 
Inman’s “ Navigation,” 6 
Instruments requisite for detailed 
surveys, 7 
Instruments and their adjustments, 10- 
45 
instruments used for astronomical obser¬ 
vations and surveying, 1-45 
Italian Alpine Club lantern, recom¬ 
mended for general purposes, 4 
Jungle or forest, General Woodthorpe’s 
article on surveying through, 109 
Jupiter’s satellites, longitude by eclipses 
of, 202-203 
Kilogkammes into pounds avoirdupois, 
table for converting, 268 ; expla¬ 
nation, 222 
Kilometres into English statute’miles, 
table for converting, 266 ; expla¬ 
nation, 222 
Lantern recommended, should be made 
of copper or brass, candle lantern 
convenient, 3; Italian Alpine Club 
lantern, useful for general purposes, 
3; for illuminating wires of transit 
theodolite, 26 
Latitude, observations for, 139-149 ; 
limit of accuracy that a good observer 
with a six-inch sextant may expect to 
attain, 89; by meridian altitude of a 
star, example, 140-141 ; by meridian 
altitudes of a star above and below the 
pole, 141 ; by meridian altitude of sun, 
example, 139; by reduction to the 
meridian, sun example, 142-143; star 
example, 144-145 ; by double altitude, 
147 ; example, 148-149; table of re¬ 
duction of the, 425 ; explanation, 231 
Latitude and azimuth, method of cor¬ 
recting route survey by, 81-82; 
surveying and fixing positions by 
means of, note, with plan, 132 
Lead pencils, recommended, 6 
Lengths of different joints of the arm and 
hand, 54 
Level on vernier arm of transit theodo¬ 
lite, how to find value of division of, 
34 
Level error of theodolite, how to ascer¬ 
tain, and correct altitude for, 34 
Level error, how to find and correct for. 
in observation for longitude by moon 
culminating stars, 201 
Linear value in miles of a degree of arc, 
measured along parallels of latitude, 
table, 67 
Linear value in miles of a degree of arc, 
measured along the meridian, table, 68 
