VI 
CONTENTS. 
PART III. 
PAGE 
Surveying ........... 75-134 
Mapping a Country, 75—Route Survey with Prismatic Compass, 
Boiling-Point Thermometer and Aneroid, 76—Hints on Use of 
Sextant in Surveying, 83—Table for ascertaining Heights and 
Distances by the Sextant, 84—Surveying with Sextant and Pris¬ 
matic Compass (by General Sir C. W. Wilson, r.e., k.c.b.), 87— 
Surveying with the Plane Table, 97—Different Methods of Orienting 
the Plane Table, 99—Method of Making Route Surveys through 
Jungle or Forest or on a Steep Hillside (by the late General R. G. 
Woodthorpe, r.e.), 109—Surveying with the Tacheometer, 111— 
Bar-Subtense Survey (by the late Col. H.C. B. Tanner), 113—Survey¬ 
ing with the Theodolite, 116—Extending a Base Line by Triangula¬ 
tion, 121—Photographic Surveying (by J. Bridges Lee, M.A., 
F.G.S.), 123—Surveying a Country and Fixing Positions by means 
of Latitudes and Azimuths, 132. 
PART IV. 
Astronomical Observations . 135-208 
Necessity for Astronomical Observations, 135—Observations of 
Heavenly Bodies with the Sextant, 137. 
• 
Observations for Latitude ........ 139-149 
Latitude by Meridian Altitude of a Star, 139—To Find the Time of 
Meridian Passage of a Star, 140— Latitude by Pole Star, 141— 
Circum-meridian Observations, or Observations near the Meridian, 
141—Latitude by Altitudes of Sun near the Meridian, 142—Lati¬ 
tude by Altitudes of a Star or Planet, near the Meridian, 144— 
Latitude by North and South Stars, 146—Latitude by Double Alti¬ 
tude, 147. 
Observations for Finding Time and. Longitude . . . • • 150-203 
Sidereal, Apparent and Mean Time, 150—To find a lost date, 150— 
To Find Error of Watch by Absolute Altitudes, 152—Longitude by 
Chronometer, from Altitudes of Sun, 155—Longitude by Chrono¬ 
meter, from Altitude of a Star, 157—Equal Altitudes of Sun, Star 
or Planet, 158—To Find Error of the Watch by Equal Altitudes 
