564 



HYDROGRAPHICAL SURVEYING 



Bore, tidal 

 Buoy, beacon 



„ small, for boats 



PAGES 



249 



55 



202 



Caims . . . . . . . . 43 



Calculated angles, use of . . . . 127 



Canvas, use of, in marks. . . . 49 



Catalogues, star . . . . . . 273 



Catalogues, star, obtaining appar- 

 ent place from . . . . . . 289 



Centring error . . . . . .7, 282 



Chains, measuring . , . . 34 



Chart, colouring on . . . . 378 



„ completed , . . . . . 373 



,, delineation of . . . . 378 



„ distortion of printed . . 409 



„ fair 373 



,, graduation of . . . . 383 



,, memoir of construction of 389 



,, names on . . . . . . 381 



,, original . . . . . . 373 



„ scale of .. 64,201,271,382 



,, soundings on original . . 383 



,, transferring to Mercator . . 390 



,, transmission home . . 373 

 Check angles, selection of objects 



for 199 



Chords, calculating . . . . 120 



„ plotting by .. . . 119 



„ proof of formula. . App. C. 



,, table of . . . . App. J. 



Chronograph . . . . . . 301 



,, use of . . . . 303 



Chronometer rates, diagram show- 

 ing 335 



Chronometers . . . • . . 46 

 ,, comparing . . 299 

 „ comparison of . . 300 

 ,, comparison book.. 47 

 ,, defects in pocket . . 299 

 ,, effect of tempera- 

 ture on . . . . 338 



„ observations for 



error of . . . . 292 



,, rejecting results of 334 

 ,, stowage of 46, 340 



„ variation in rates of 337 



,, winding . . . . 46 



Circum-meridian altitudes of stars 272 



of sun 289 

 ,, ,, of sun at 



sea 372 



Clearing marks . . . . . . 205 



Clinometer, use of . . .. .. 253 



Coast-line of island . . . . 192 



Coast-lining . . . . . . 185 



Coast survey, triangulated . . 80 

 Collimating screws, action of , . 17 

 CoUimation of theodolite, adjust- 

 ment for . . . . 16 



CoUimation of theodolite in heights 257 



Colouring 378 



Comparing watches . . . . 299 



Compass bearing .. .. .. 214 



Compass, deviation of . . . . 418 



,, variation of . . . . 361 



Conspicuous natural object, con- 

 nection with adjacent station. . 92 

 Contouring . . . . . . 253 



Convergency of meridians 97, 104 



„ by spherical tri- 



angle . . 102, 384 

 „ ajiplication of . . 105 



,, formulae . . . . 102 



,, neglect of . . . . 130 



,, proof of formula Api). A. 



„ proof of rule in gradu- 



ating . . App. B. 

 Co-ordinates, rectangular . . 467 



Current, ascertaining rate of . . 244 

 ., drag .. .. .. 410 



log 244 



,, under, observations on . . 410 

 ,, meter, Pillsbury . . 413 



„ meters . , . . . , 413 



D 



Danger line . . . . . . 197 



Datum for reduction . . . . 221 



,, ,, a^jproximat- 



ing as . . 227 



Decimal of a day, time in Apj). S. 



Deck-book 214 



,, entries in, relative to 



beacon . . . . 498 



„ form . . . . A^pp. G. 



Deep-sea soundings . . . , 391 



Definitions, tidal . . . . . , 220 



Degrees, lengths of . . App. L. 



Delineation of charts . . . . 378 



Deviation by distant object . . 418 



,, by leciprocal bearings 419 



,, by swinging . . . . 418 



Dip in heights . . . . . . 260 



„ Table of . . App. N. 



Distortion of printed charts . . 409 



Diurnal inequality . . . . 221 



Double altitude at sea . . . . 367 



,, calculated angles . . .. 126 



Douglas-Schafer, sounding tra- 

 veller . . . . . . . . 434 



Drawing boards . . . . . . 41 



,, rectangular lines . . 172 



Dredging . . . . . . . . 403 



Dry proofs . . . . . . 409 



E 



Electric light 

 Elevations 

 Equal altitudes 



.. 10 



190, 258, 266 



295-296 



