Page 890 



INDEX 



Reference 



Aluminum 5heet(s)— Continued. ^o- F&gc 



Data from transferred to smooth sheets.- 713 660 



dimensions -- 7131 661 



Enameled - 7132 661 



Grained ...- 7131 661 



Disposal - 7131 661 



Ink lines on .removing 7131 661 



Pencilingon 7131 661 



Pencil marks on .removing 7131 661 



not used as smooth sheets 713 661 



Painted - 7132 661 



Paper-mounted 7133 661 



Preparation of .method 7133 661 



Warping tendency 7133 661 



American Philosophical Society, Transactions- 6322 583 



Amglo Corporation 2813 164 



Ammunition magazine, care of 666 623 



Amplifier, audio, of sono-radio buoys (see Sono- 



radio buoys, amplifier) 

 Amplifier, chronograph (see Chronograph am- 

 plifier) 

 Amplifier(s), echo (see also under name of spe- 

 cific instrument) 



characteristics 5163 453 



description 5163 453 



Dorsey Fathometer No. 1 .- 5242 475 



Dorsey Fathometer No. 3 5262 482 



Purpose 5163 453 



312 Fathometer 5214 458 



Time-lag variations in 5163 453 



Anchorage(s) 



Coast Pilot requirements - - 916 825 



Recommended , Descriptive Report re- 

 quirements 8420 789 



regulations given in Coast Pilot 916 825 



selected in advance 1334 20 



Sounding-line spacing reduced in 354 272 



surveyed in advance of use < 3^3 3Qg 



Anchor cable, buoy, scope (see Buoys, survey, 

 anchor scope) 



Anchor-detaching apparatus for buoys, de- 

 scription 2834 174 



Anchoring buoys (seeBuoys, survey, anchoring) 

 Anchors, buoy (see Buoys, survey, anchor) 

 Anchor, ship's, bottom characteristics from 



materialon 3841 302 



Angle(s) 



Inclined (see Inclined sextant angles) 



observers in three-point fix control 3413 251 



plotted without protractor (see "Circle" 

 sheets) 



Plotting with a three-arm protractor 4534 375 



Sextant (see Cuts, sextant; Sextant an- 

 gles; and Three-point fix) 

 errors (see Sextant errors and Sounding 

 Record, errors) 



{pel I 119 



766 711 



Anglemen in hydrographic surveys, duties 3413 251 



Angle of emergence, definition. _ . 6232 570 



Angle of incidence, definition 16232 571 



Angle of refraction of sound 6222 563 



Annual report, requirements 8516 796 



Anomaly, magnetic, evidenced by discrepancy 



between magnetic and gyrocompass.- 442 339 



Antenna at R. A. R. shore stations 2615 150 



Antenna, ship, for R. A. R.. 6723 631 



Directivity test of 6723 631 



Requirements 6723 631 



Testing effectiveness of 6723 631 



Apparent horizontal velocity (see Velocity of 

 sound, apparent horizontal) 



Arago, Dominique Francois Jean 512 439 



Arcs 



Constructing on "circle" sheets... ... 3741c 290 



Distance R. A. R. (See R. A. R. dis- 

 tance arcs) 



Instrument . graduated, cleaning 4313 332 



Area(s) 



Dangerous . surveyed from launches 361 276 



Foul (see Foul areas) 



reports required 8351F 785 



Unsounded 



described in Sounding Record 815 767 



V, ,. ,. 1367 285 



symbolization 17828 737 



Arming sounding lead... 4664 398 



Arrows, use on smooth sheets 7914 749 



Astronomic 

 azimuths 



from Captain Weir's Azimuth Diagrams... 3382 239 



from tables 3382 239 



in triangulation, probable error 223 75 



to check gyrocompass 442 339 



Reference 

 No. 



Astronomic— Continued, 

 control 



{8312 

 8313 



records and reports required 8351E 



ILne(s) of position 



Accuracy 3384 



combining to form rectangular figure.. 3387 



Dead reckoning adjusted to single 3383 



Finding position from 3387 



One observation, value of 3383 



Plotting 3387 



Plotting on smooth sheet 764 



Position derived from 3387 



run up or back in plotting 3387 



observation (s) (see also Sextant angles, ver- 

 tical, and Star sights) 338 



Accidental errors of 3384 A 



Accuracy g5 



Altitude change, effect of 3384 



Altitude change, predicting 3385 



Formula for 3385 



Altitude of observed bodies, preferable 3387A 



azimuths 



from Captain Weir's Azimuth Diagrams. 3382 



from tables 3382 



Compensating errors in 3387A 



computations 3382 



Accuracy 3382 



Control buoys located by 12571 



controlling a running survey 3941 



controlling sounding lines 

 Records required 8313 



{3322 

 3323(e) 



Dead reckoning sounding lines, when f3371 



are required in \338 



errors 3384A 



errors in east-west direction 3384B 



experience necessary for good results 3384 A 



Horizon distinctness important. 3384C 



Hydrographic surveying, use of in 338 



Intervals between successive sights 3384D 



Log readings correlated with 3381 



Low altitudes in Tropics 3387A 



Night 3387A 



Observer's elevation, varying 3381C 



Observing precautions 3384D 



Observing sequence in morning and eve- 

 ning 3387A 



Personal errors 3384B 



r, ,.• /3384E 



Ratings |33g5 



3382 



records, transmittal -^3387 



18313 



Time errors in 3384B 



Effect 3384 



Formula 3384 



Time of , marking 3384 



(3384E 



Weighting <3385 



[3387 



positions, plotting on smooth sheet 764 



Astronomy, reference books (list) 9533 



Atlantic Coast, transmission of sound along... 6233 



Atlas Werke Company 533 



Attenuation of sound (see Sound, attenuation of) 



Attenuator, circuit diagram 6542 



Attenuator, description 6542 



Automatic key, former use in R.A.R 6852 



Auxiliary vessels (see Vessels, auxiliary) 

 Awash recks (see Rocks, awash) 

 Azimuth, back (see Back azimuth) 

 Azimuth circle 



Cleaning after use 4312 



Descript ion 4433 



Testins by compass ashore 4433 



Testing on planetable 4433 



with telescopic sight (see Telescopic alidade) 



Azimuth diagram. Captain Weir's 3382 



Azimuth marks at triangulation stations 226 



Stamping disk in moved 2263 



Azimuths from piers for gyrocompass use 356 



Azimuths of navigation ranges 



determined by hydrography.. 3833 



determined by topography 3833 



Azimuth, sun (see Sun azimuth) 



B 



Back azimuth computation 942 



Back azimuths needed in buoy computations.. 2523 



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