Page 910 



INDEX 



Hydrographic— Continued. Reference 



survey(s)— continued. No. 



in advance of control 392 



inde.x, at Washington Oflice 931 



inshore linit 3532 



junctions (see Junctions) 



Large-scale controlled from shore 3342 



Large-scale , controlling 334 



Large-scale , launches and small boats 



to be used .- 135 



Launch where signals are not visible. _ 3366 



Numbering (see Field numbers and 



Registry numbers) 



Numbering positions 331 



numbers (see Field numbers and Registry 

 numbers) 



Office statistics 9339 



Office work required at Processing Offices-. 9241 



Office work required of field party 9231 



Offshore 



Bottom characteristics obtained on . 3842 



Limits of 122 



Plotting on large scale 37 



Old (see Prior surveys, hydrographic) 



omissions supplied in the field. 79 



Other organizations' 



Duplication of 3131 



Junctions with 3131 



Transmitting data to Washington 



Office 834 



persoimel, duties of 341 



Photographic copies of furnished with 



instructions 1214 



position data in a separate record book 831 



Project area divided into zones for 134 



Project instructions for 1214 



Projection used for 7321 



Purpose 31 



Recommending add itional field work 9348/ 



records 



Custody of at Washington Office ... 931 



Receipt at Washington Office 931 



registry numbers, assignment of 931 



Requirement (list) 8351 



Shipment of 836 



registry numbers 



Assignment of 931 



Proper use of 9339 



Registry of at Washington Office 931 



requirements 31 



review 



by hydrographer ... 3257 



filed in Descriptive Report S44d 



in Washington Office.. 934 



scales 1 133 



Relation to sounding line spacing 315 



Shipment of records separately 326 



Statistics required in Descriptive Report.. 8431 



Superseded listed in review 93i8K 



Supervision by Chief of Party 3411 



Term as used in this Manual 114 



Tidal datums, record in Descriptive Re- 

 port 844c 



Transit used to control 3342 



Verification at Washington Office 933 



Report 9339 



What a comprises 1132 



Hydrography 



books, reference (list) 9531 



Definition 1131 



General statement 31 



Hydrometer jar 4752 



Sponge rubber in bottom of 4752 



Use on board ship 4752 



Wooden base for 4752 



Hydrometers (see oZ«o Salinity of sea water, and 



Specific gravity of sea water) 4751 



Calibration of 4751 



Description 4751 



How to read 4753 



Ranges of graduation 4751 



Standard of graduation 4751 



Hydrometer sets 475 



Hydrophone (s) 

 Echo-sounding instrument (see also Re- 

 ceiving units, acoustic) 



Carbon-button element 5162 



Testing and adjusting 5267(p) 



312 Fathometer 5213 



R.A.R. (see also Hydrophones, sono- 



radio buoy) 656 



Bomb signal prolongation at 6432 



classification 656 



Damage caused by nearby bomb explo- 

 sions 2533 



Description 656 



Displacement type... 656 



Page 

 308 

 847 

 271 



223 

 223 



22 

 231 



212 



854 

 845 

 844 



303 

 13 



286 



747 



194 

 194 



783 

 250 



11 



775 

 20 

 11 

 667 

 191 

 859 



847 

 847 

 847 

 784 

 785 



847 

 854 

 847 

 191 



211 

 793 



854 

 7 

 200 

 211 

 791 

 859 

 250 



793 

 224 



854 

 7 



6 

 191 

 412 

 412 

 412 

 412 



411 

 411 

 411 

 411 

 411 

 411 

 410 



451 

 495 

 457 



613 

 598 

 613 



122 

 613 

 613 



II ydrophone(s)— Continued. Reference 



R. A. R.— Continued. No. Page 



Function 656 613 



Location of on vessel 6721 629 



Pressure-operated 656 613 



Ship installation of 6721 629 



Shore station 



Anchoring method 2612 148 



Description 2612 148 



located by short R.A.R. distances from 



three-point se.xtant fl.xes... 2534 123 



Preferable type .^... 2613 149 



Relation to R.A.R. shore station 2611(a) 148 



Selection of site 2612o 148 



sites 641 .596 



Types used on vessel.- 6721 629 



Velocity type 656 613 



Sono-radio buoy (see also Hydrophones, 



R.A.R. 



armature, adjustment of 6565 618 



Construction requirements 656(9) 614 



Design requirements 656(a) to (j) 613 



Directivity of 656(c) 613 



Dorsey (illustration) 6561 614 



cables 6562 616 



compared with Vincent hydrophone 6563 615 



Description 6561 614 



suspension methods 6562 615 



Whereused.... ...g^ 614 



Frequency response of 656(6) 613 



leakage 6565 618 



sensitivity requirements 656(a), (d), 613 



(e) 



suspension 2841(A) 179 



tests, continuity 6565 618 



Types... 656 614 



Vincent 6563 615 



Advantages 6563 616 



cable, electric 6564 617 



compared with Dorsey hydrophone 6563 616 



Large type, description 6563 616 



Large type, suspension 6564 616 



Small type, description 6563 616 



Small type, suspension 6564 617 



suspension 6564 616 



Where used 656 614 



Weight requirements 656(/j 614 



Hydro-radio switch, function 6724 631 



Hydro-radio switch, operation 6724 632 



Hypothalassa, definition 632a 576 



Hypsograph, used with sextometer 2382 96 



I 



Ice affecting navigation 916 833 



Identification of stars 3387B 248 



IllumLnation of ship drafting room 4113 317 



{6221 "^fil 



6232 571 



Incidence, angle of, effect on path of sound 6232 571 



{3338 221 



4526 372 

 Reduction to horizontal 



Both objects elevated (/ormMZo) 3338 221 



Computation form 3338 221 



Correction graph 3338 221 



formula 941 861 



One elevated object (/ormJiZa) ■ 3338 221 



Incomplete sheets, undesirable at end of season. 1343 21 

 Index adjustment, echo-sounding instruments 

 (see also under name of specific instru- 

 ment) 554 514 



{557 526 



5572((i) 527 



C onditions to be observed 5572((i) 527 



facilities 554 514 



for settlement and squat, effect on soundings 



not underway 553 513 



for velocity corrections, specifications for use. 5616a 538 



Record of each 554 514 



Separation effect on 556 526 



must be accounted for in certain instru- 556 526 

 ments 

 Index disk (see under name of specffic instru- 

 ment) 

 Index disk speed («ee Motor speed, echo-sound- 

 ing instrument) 

 Index, echo-sounding instrument (see under 

 name of specific instrument) 



Index error, sextant 4517 366 



Indexing a publication 9139 822 



Indications, shoal, to be developed 355 273 



Indicator, echo-sounding instrument (see also 

 under name of specific instrument) 



Dorsey Fathometer No. 1 5243 475 



