INDEX 



Page 915 



Reference 



No. Page 



Newton .-- -. — - 63 674 



Nibs, ruling pen, sharpening 4843 432 



Nickel, magnetostriction property of 5161B 450 



Night effect in radio bearings 4444(!) 349 



Nine-lens camera, focallength 2221 74 



Nine-lens photographs (see also Air photo- 

 graphs) 



239 98 



Overlap between 2231 76 



"No bottom" soundings (see also Soundings, 

 missed) 



Recording 8143 762 



Nomenclature 



for landmarks. 8534C 802 



Geographic name (see Geographic 



names) 

 Standard list for use in Coast Pilots and hy- 



drographic reports 917 841 



Submarine feature 168 53 



Nondireotive transmitted sound signals 5145 445 



North American datum,.. _ {2171 68 



North American datum of 1927 1125 6 



Definition : 2171 68 



Where printed on nautical charts 8533 799 



Notes 



Boat-sheet , advantages 3255 211 



Explanatory on smooth sheets 



Inking 933 849 



in sounded areas 781 733 



Lettering, style and size 781 733 



Requirements 781 733 



Temporary , removal from smooth sheet 



before transmittal 7915 749 



Notice to Mariners, survey-buoy positions re- 



ported in {^^ 1| 



Numbers 



Confusion of 811 757 



enunciated plainly 4623 386 



Position (see Positions, hydrographic num- 

 bers) 



Survey or sheet (see also Field numbers. 



Registry numbers, and Survey num- 

 bers) 793 749 



Numerals in smooth-sheet soundings 



Orientation 7733 723 



Placement 7736 724 



Size 7732 722 



Style 7731 722 



Numerals, slanting, use of 723 664 



Numerical determination of velocity corrections 



(see also Velocity of sound corrections) 5613 531 



Example iabhm 532 



o 



Objects 



Distant , observing bearings on 4436 345 



Indefinite in three-point fixes 3336 219 



in water to be referenced to sounding line 3353 226 



Natural (see Features, natural) 



Obstructions to navigation (see also Dangers to (916 835 



navigation, and Least depths) \916 836 



removed by blasting, to be wire-dragged 3523 270 



Smooth-sheet representation 7869 745 



to be located 365 282 



Ocean basins, sedimentary deposits in 476 413 



Oceanic dangers, searching for 3151 202 



Oceanographic instrument(s) 47 400 



Care of 47 400 



Metal used in 47 400 



Miscellaneous .. ... 478 417 



tests 47 400 



Oceanography, reference books (list) 9531 869 



Ocean waters, study of circulation in 478 417 



Odessey R. A. R. protractor 4537 377 



Description 4537 377 



Use in plotting R. A. R. distances 4537 377 



Use in plotting R. A. R. positions ^^^\a 703 



Office of a survey ship 4114 318 



Offlcer-in-charge of 



hydrographic survey, duties 3412 251 



R. A. R 671 626 



duties /6711 627 



auties |g^j2 627 



survey unit, responsible for instruments 431 331 



Officer, navigating (see Navigating officer) 



Officer on the bridge (see Bridge, ship, officer) 



Office work, monthly progeess report required. 8514 795 



Offset traverse 2284 86 



Offshore 



areas, to be surveyed by ship... 135 22 



Reference 



Offshore— Continued. No. Page 



details to be located by topographer 2312 89 



hydrographic surveys 



By-product value of 1134 7 



Large-scale , method of plotting _ . 735 677 



Use on charts 11 1 



limit, hydrographic surveys 122 13 



shoals, use of buoys for control 25 110 



sounding lines, use of astronomic observations.|»xIK.-, Hqq 



soundings, accuracy of location 213 62 



tide observations (see Tide observations with 

 Dorsey Fathometer) 



Old surveys (see Prior surveys) 



One-barrel buoy (see Buoys, survey, one-barrel) 



100-fathom cutout, 312 Fathometer 5215 459 



1,000-fathom cutout, Dorsey Fathometer No. 3. 5263 483 



Ooze, in oceanic basins 3848 306 



Operation, faulty, Dorsey Fathometer No. 3... table 17 491 



Opisometer (see also Map measure) 4832 430 



Description 4832 430 



Method of use 4832 430 



Purpose 4832 430 



Organization of survey operations 14 27 



Orientation of 



lettering on smooth sheets 722 663 



sheets 1362 25 



soundings onsmoothsheets 7733 723 



Oscillator; (see also Magnetostrictive; Piezo- 

 electric; Transmitting units, acous- 

 tic; and under name of specific in- 

 strument) 



312 Fathometer 5211 456 



Oscilloscope, use in tuning Dorsey Fathometer 



N0.3 ... 5267(i) 494 



Overhead clearances, required on smooth sheet-. 7846 742 



Overlap 



of adjoining surveys, comparison required. . . 788 747 



required at junctions of hydrographic surveys. 3132 195 



Soundings in not transferred in field 788 747 



Tracings of forwarded with smooth sheet. 788 747 



Overlay tracings in congested areas 



Disposal of 7752 729 



Instructions for preparing 7752 728 



referenced to smooth sheet 7752 728 



Silted areas shown on 7831 739 



supplementing smooth sheet _ 7752 728 



Where required 7752 728 



Ozalid prints 



Description 7332 675 



of air photographic surveys {7332 674 



Pacific Coast, transmission of sound on 6233 573 



Page proofs, correcting 9138 822 



Page references in Coast Pilots 916 836 



Pantograph. 4853 434 



Description 4853 434 



Formula for setting 4853 435 



Method of use 4853 434 



Purpose 4853 434 



Range 4853 435 



Paper, drawing 



Aluminum-mounted 7133 661 



Boat-sheet 3221 204 



Defective to be reported 7113 658 



distortion (see a?so Distortion) 7114 658 



Requirements, general 7113 658 



requisitions 7117 659 



Rolled 7116 659 



Removing from roll 7116 659 



Seasoning _ 7115 659 



sizes 1^"' 657 



sizes -\n\2 657 



Smooth-sheet 711 657 



Paper-strip method of transferring details from 



photographs 2394B(2) 103 



Paper, tracing (see Tracing paper) 



Paperweights 4835 432 



Lead shot advantages 4835 432 



"Paragon" drawing paper 7112 657 



Paralysis ranges, Dorsey Fathometer No. 3 5266 487 



Parkhurst anchor-detaching apparatus 2834 174 



Passages, spacing sounding lines in 3152 202 



Patent log (see Log, ship, taffrail) 



Path of sound (see Sound, path of) 



Payment for services, not allowed to Federal 



employees 271 153 



PD on charts, investigation of. .^ 172 56 



Pelorus 



^"'^^'^e'^t -- S37 346 



bearings, correcting 4434 344 



