Page 906 



INDEX 



Reference 

 Explorer— Continued. ^^^ 



Sounding machines, wire - 4122 



Survey equipment.- 4122 



Ventilat ion system 4121 



Watertight compartments in _ _ 4121 



Explosions, subaqueous, probable frequency 



of 65G(6) 



Explosive(s) (.tef a/«o Bombs and TNT) ,._ 66 



Disposal at end of season. ._ 665 



DONT'S for R. A. R 669 



Precautions in handling 1669 



Storage during ship repairs 665 



Stowage. 665 



F 



Factor, log (see Log factor) 



Faint objects, sextant angles to 4522 



Fair-lead, registering sheave used as 464 



Fair sheet (see Smooth sheet) 

 Fathogram(s) (see also Echo soundings) 



accuracy, factors affecting 571 



advantages, permanency of record 563 



(571c 



Carbon nodules, effect on <fig. 118 



[fig. 119 



Definition 5233 



Doubtful depths, investigation required 571 



808 Fathometer 



Bottom relief types illustrated fig. 117 



Defective , causes of 5238 



Defective , types 5238(p) 



\fig. 117 



Illustrations of <ftg. 118 



[fig. 119 



Notations for correcting soundings 5545 



paper 5233 



depth scales 5233 



Description 5233 



Phase identification 5233 



Placing on instrument 5233 



qualities _. 5233 



travel speed jg^g^ 



Checking 5716 



travel speed used to verify tachometer... 5554 

 scale ratios 563 



scales, depth... |^||y 



Experimental Sounding Records for use 



with 817 



Faulty instrumental operation (illustra-]^^^ 



lions) [fil'.iw 



mterpretation 571 



Bottom record continuous, not proof of no 



danger (example) 671 



Bottom types, how registered 571d 



Echo not received from steep slope (illus- 

 tration) fig. 118 



f 571a 

 Gain control improperly adjusted (illusAfig. 117 



trations) ] fig. 118 



[fig. 119 



Investigation of doubtful points 571 



Kelp or other marine growth, reflections 



from 571/ 



Illustrations. Ifig.117 



,. ,. \fig.ll9 



Investigatmg 57iy 



Motor-speed variation (illustration) (fi //« 



Precaution necessary in 571 



Reflections, side 571d 



Resemblance to silt layers (illustration)., fig. 117 



Shoal indications to be investigated 571« 



Shoals distinguished from reflections from 



Icelp 571/ 



Shoals (illustration) fig. 118 



f571ff 



Stray indications (illustrations) <fig. 117 



[fig. 119 

 Kelp or other marine growth, reflections from. 571/ 

 Least and greatest depths to be shown on 



sheet 7726 



Notations properly made on _ .fig. 120 



paper (see Fathogram, 808 Fathometer, paper, 

 and under name of specific instru- 

 ment) 



profile, composite nature of 563 



profile, not a true line profile 563 



requirements 571 



Scale exaggeration on 563 



Scaling when transceiver is used 556 



Selecting smooth-sheet soundings from .. 7726 



Page 

 320 

 320 

 319 

 319 



613 



618 

 622 

 625 

 618 

 625 

 622 

 622 



369 

 393 



543 

 542 

 546 

 547 

 548 

 466 

 549 



545 

 472 

 473 

 545 

 547 

 548 

 520 

 466 

 466 

 466 

 466 

 468 

 466 

 466 

 523 

 544 

 523 

 542 

 462 

 471 



768 

 544 

 547 

 548 

 543 



549 

 546 



547 

 544 

 545 

 547 

 548 

 549 



546 

 545 

 548 

 546 

 544 

 547 

 549 

 546 

 545 

 546 



546 

 547 

 549 

 545 

 548 

 546 



722 

 550 



540 

 540 

 549 

 542 

 526 

 722 



Reference 

 Fathogram (s)— Continued. ^^^ 



Shoal indications on 571« 



Simultaneous comparisons identified on . 5522 



Slope exaggeration on 563 



soundings 



Boat-sheet use 3433 



corrected mechanically 562 



Correcting for separation of acoustic 



units 556 



Gain adjustment, effect on 571a 



.Spacing on smooth sheet 7723 



stamp --{%%e 



Fathometer (see also Echo-sounding instru- 

 ment) 

 attendant 



Duties 3415 



in deep water 3415 



Instrument operation, familiarity with {57 



Multiple echoes to be recognized 57(e) 



Strays to be distinguished from echoes 57(ft) 



to have no other duties 3415 



Visual instrument observed continuouly... 57(d) 

 instruments 

 Dorsey No. 1 (see Dorsey Fathometer No. 1) 

 Dorsey No. 2 (see Dorsey Fathometer No. 2) 

 Dorsey No. 3 (see Dorsey Fathometer No. 3) 



Adjusting and testing 5267 



808 Fathometer (see 808 Fathometer) 

 installation (see under name of specific 



instrument) 

 Simplex-Bludworth (see Simplex-Blud- 



worth Fathometer) 

 312 Fathometer (see 312 Fathometer) 

 soundings (see Echo soundings) 

 Fathoms 

 Atlantic Coast use, on hydrographic sheets.. 7711(a) 



Conversion table table 37 



not mixed with feet, in soundings 8143 



not used on a sheet with soundings in feet. .. 771 

 Features 



Artifical located by triangulation.. 221 



Charted not always from C. & G. S. 



surveys 3522 



Coastal , terminology 16826 



Marginal continental , terminology 1681a 



named on hydrographic surveys 161 



named on topographic surveys 161 



Natural 



Appearance from offshore 247 



cut in from vessel 3941 



Method 247 



Descriptions required 247 



where used as control stations 3231 



Identification of for use as signals 2461 



located from the vessel {3941 



Umiamed , assigning names to 164 



used as control stations 247 



Natural or artifical 



Descriptions, when located 2142 



located by triangulation, descriptions 



required 2142 



used as control stations 214 



Description required 781(d) 



Naming 2158 



Possibility of errors if not described 2142 



used for hydrographic signals 271 



not requiring verification or disproving 351 



Primary submarine , terminology 1681 



Secondary submarine , terminology 1682d, e 



Federal agencies listed in Coast Pilot appendix. 9135S(5) 

 Federal offices, local, sources of Coast Pilot in- 

 formation 9131c 



Feet, conversion table table 57 



Feet, use on Pacific Coast hydrographic sheets. 7712 



Ferry routes, smooth-sheet requirements 7867 



Fessenden, R. A., experiments of 512 



Field examinations 



Definition 176 



Submittal of results 176 



Field inspection, coast pilot (see Coast pilot field 



inspection) 

 Field numbers of surveys 



Explanation of 1541 



Standard to be followed 1541 



Useof 1541 



Use of on smooth sheets 793 



Field party, oflfice work on records 923 



Field Record Book, Coast Pilot {91326 



Authorities noted in 191326 



Colored inks used \ 91326 



Description.. 9131o 



Page 

 546 

 512 

 642 



258 

 539 



526 

 544 

 720 

 543 

 544 



252 

 252 

 252 

 542 

 543 

 543 

 252 

 543 



493 



715 

 882 

 762 

 714 



269 

 55 

 54 

 47 

 47 



108 

 309 

 108 

 108 

 206 

 106 

 108 

 309 

 50 

 108 



64 

 63 



734 

 66 

 63 



152 



268 

 54 

 55 



820 



812 

 882 

 715 

 744 

 440 



57 

 58 



39 



39 



40 



749 



844 



811 



813 



811 



813 



811 



813 



811 



