INDEX 



PAGES 



Accuracy, remarks on . . . . 63 



Adjusting theodolite . . . . 16 



Altitudes, circum-meridian . . 272 



,, ,, at sea 372 



equal . . . . 295-296 



,, ,, short . . . . 372 



Amalgamated trough . . . . 15 



Anchorages, marking of, on chart 204 



Aneroids, pocket 35 



,, use of, in heights . . 266 

 Angles, approximate measure- 

 ment by means of the 



hand 191 



„ calculated, use of . . 127 



,, double, calculated . . 126 



,, observing main . . .. 84 



,, of depression, plottuig 



work by . . . . 461 



,, plotting . . . . . . 119 



,, precautions when taken 



from ship . . . . 168 



,, repeating theodolite 21, 85 



,, selection of zeros . . 168 



,, sextant, difficulties with 254 

 ,, subtended by different 



lengths . . Aj)p. O. 



,, subtended by known dis- 

 tance, proof of for- 

 mula . . . . App. W. 



Arbitrary plotting point, use of . . 458 



Artificial horizon . . . . . . 14 



Astronomical observations for 



scale .. .. .. 271, 382 



Astronomical observations, when 



taken . . . . . . . . 64 



Astronomical positions, correcting 



triangulation to . . . . 108 



B 



Bank, large, out of sight of land . . 206 



,, sounding a . . . . 205 



searching for . . . . 214 



Barometer, aneroid 



,, metrical and English 



compared . . App- 



PAGES 



35 



Bases 



by angle of short measured 

 length 



by chain 



by difference of latitude . . 



by masthead angle 



by masthead angles from 

 two stations 



by patent log 



by range-finder 



by rope 



by ship and single theodo- 

 lite station 



by ship between two 

 stations . . 



by sound . . 



,, details of 



T. 

 66 



71 



66 

 69 

 70 



71 

 183 



72 

 73 



76 



App. 



76 



73 



77 



F. 



67 



.. 58 



.. 55 



.. 205 



.. 214 



101, 104 



.. 351 



563 



,, ,, formula . 

 ,, extension of 

 Beacon, fixed 

 Beacons, floating . . 

 ,, use of . . 

 Bearing, compass 

 ,, mercatorial 

 ,, true 

 Blue prints, preparation of reduc- 

 tion of 377 



Boards, drawing . . . . . . 41 



field .. ..145,255,374 



Boats' fittings . . . . . . 50 



,, ,, gear .. .. 52 



,, for sounding and as mark 



boats . . . . . . 504 



,, sweeping, Capt. Coombes' 



method 448 



,, sweeping, otter sweep . . 444 



,, ,, sealark sweep 440 



Books, blank . . . . . . 45 



„ deck- 214 



,, form for height . . . . 262 



,, sight, form of . . . . ?05 



36—2 



