436 
INDEX. 
“ Text-Book of Military Topography,” 
extract from vol. ii., 33 
Theodolite, transit, description of, with 
illustration, 24-26; adjustments of, 
26-30 ; observations with the, should 
be taken with face left and face right, 
appearance of sun’s upper and lower 
limb in, when inverting and diagonal 
eye-pieces are used, 31; description 
and adjustments of form with tele¬ 
scope on vernier arm, with illustration, 
31-33; how to find the value of a 
division of the level scale, and the 
correction for level error, 33-34 ; how 
to use the magnetic needle of, 34; 
surveying with the, different methods 
of, article and three diagrams, 117 ; 
extending base line by triangulation 
with, 120 ; correction for level error 
should be applied to altitudes taken 
with, 137 
Thermometers, ordinary and boiling- 
point, charges for testing at the Na¬ 
tional Physical Laboratory, 8; error I 
liable to change in course of time, 
should be re-tested occasionally, 8 ; 
table of comparisons of Fahrenheit, 
Reaumur and Centigrade scales, with 
multipliers, 259 ; explanation, 222 
Three-point problem, fixing position by, 94 
Time, different measures of, 150; defini¬ 
tion of mean, apparent and sidereal 
time, 150 
Time into arc, table for converting, 422 ; 
explanation, 230 
Time and longitude, observations for, 
151-203 
Tracing-cloth and paper, 6 
Transit theodolite ( see Theodolite , Transit ) 
Traverse-table, 269-277 ; explanation, 
222 
Triangulating with a theodolite, 119 
Trigonometry, plane, formulae and ex¬ 
amples, suited to surveying purposes, 
46-51; solution of problems in, con¬ 
nected with surveying, 92 
Variation, magnetic, chart showing 
lines of equal, 82 
Versts into English statute miles, con¬ 
version of, table, 267 ; explanation, 
222 
Watch, silver, half-chronometer, packing, 
2 ; charges for testing at the National 
Physical Laboratory, 8; half-chrono¬ 
meter, suited for astronomical observa¬ 
tions, description of, to be preferred to 
pocket chronometers, should be in 
water-tight case, 43-44; necessity of 
ascertaining rate of, 45; to find the 
error of, by absolute altitudes, examples, 
153-154; by equal altitudes of sun, 
160-161; by equal altitudes of stars, 
162-163; to find rate of, 163 
Water-colours, for mapping, 6 
Watkin mountain aneroid, advantage 
claimed for, over ordinary, for obtain¬ 
ing heights, 15; Mr. E. Whympers 
remarks on the, referred to, 14 
1 Whitaker’s Almanac,’ useful to tra¬ 
vellers, 7 
Whymper, Mr. E., his book 4 How to 
use the Aneroid Barometer,’ and his 
report on the Watkin mountain ane¬ 
roid, referred to, 14 
Wilson, Gen. Sir C. W., R.E., k.C.b., his 
article, “ Surveys with Sextant and 
Prismatic Compass,” 87-97 
Wires of transit theodolite, adjustment 
of, 29 
Woodthorpe, Gen. R. G., R.E., his article 
on surveying through jungle or forest 
i or on a steep hillside, 109 
