Page 904 



INDEX 



Echo sounding(s)— Continued. Reference 



in irregular bottom— continued. '^°- 



Selecting true depth (see also Fathogram) Uy/,-) 



Uncertainty of point of reflection 563 



in strong currents 3141B 



instruments (see Echo-sounding instruments) 

 in submarine canyons 563 



Direct measurements to supplement . 563 



irregularly spaced 7723 



limitations -.- 514 



line, composite nature of 563 



line not a true profile.. 563 



Missed -.-.gJ5 



explained in Sounding Record 3542 



supplemented by wire soundings. 3542 



Motor-speed variation, effect on^— 5716 



Personnel needed for 142 



Position frequency requeirements 3313 



Precautions in reading 57(c) 



principles 511 



R. A. R., during 6811 



recorded at odd intervals. 57(g) 



Recording , approved method of (illus-(fig. 173 



traied) \fig. 17i 



Recording fluctuating 57(/) 



records and reports required (list) 8351B 



Red-light method, 312 Fathometer 5132 



selected from fathogram for smooth sheet 7726 



Separation of acoustic units, effect on ... 556 



Sloping bottom, effect on 5145 



Sloping bottom, errors due to 563 



Sonic frequencies in 512 



Spacing on smooth sheet 7723 



Statistics, not enumerated in 8161 



substitute methods 58 



Supersonic frequencies in 512 



supplemented by wire soundings 3111 



transmitted signals, length of 511 



Uncorrected used in navigation ism 



velocity of sound corrections (see Velocity of 

 sound corrections) 



White-light method, 312 Fathometer 5132 



Echo-sounding instrument (s) (see also under 

 specific name of instrument) 



Accuracy requirements. ._ ._ 3111 



adjustment 



for draft 551 



for instrumental error 552 



for motor speed 555 



for settlement and squat 553 



General statement 55 



to be made when practicable 55 



Advantages of two l^^ 



calibration { mi i 



calibration velocity entered in Sounding 



Record 8132 



Challenger type 5321 



classification 515 



by depth range 5151 



by frequency g}52g 



by registering device 5153 



combinations 545 



C orrection factors for (table 35) 9613 



draft («ee Draft of acoustic units) 



Earliest patents 512 



Echo inaudible 3542 



English (see also MS 12 D and Veslekari) _ 532 



Classification of ||^|^ 



Marconi Company instruments 5324 



magnetostrictive units 5324 



MS class instruments (see also MS 12 D 



Hughes) 5322 



Echo amplifier 5322 



Magnetostrictive units 5322 



Power for operating i. 5322 



used in C. & G. Survey 5322 



Sonic recording (Challenger) type 5321 



Visual indicating (Hughes) type 5323 



failure in deep water reported to Washington 



Office 5342 



Faulty operation of 



Effects on fathogram 571c 



(illustration) ^ fig. 119 



Foreign 53 



French 531 



Echometre, description 5312 



Echoscope, description 5313 



Page 

 542 

 543 

 Ml 

 199 



541 



541 

 720 

 443 

 540 

 540 

 252 

 272 

 272 

 272 

 544 

 29 

 214 

 543 

 437 

 636 

 543 

 755 

 756 

 543 

 784 

 441 

 722 

 524 

 445 

 540 

 440 

 720 

 767 

 552 

 441 

 192 

 437 

 446 

 542 



507 

 510 

 520 

 513 

 507 

 507 

 455 

 506 

 528 

 575 



759 

 501 

 446 

 447 

 447 

 448 

 448 

 506 



439 

 272 

 501 

 501 

 502 

 502 

 502 



501 

 502 

 502 

 502 

 502 

 501 

 502 



544 

 548 

 499 

 500 

 500 

 501 



Echo-sounding instrument(s)— Continued. Reference 

 French-Continued. ^o- 



frequencies 531 



Langevin-Touly Electrolitic Recorder, de- 

 scription 5311 



S. C. A. M.-Touly, description .WU 



transmitting and receiving units. 531 



German , description 533 



Graphic-recording (see also 808 Fath- 

 ometer; Simplex-Bludworth Fath- 

 ometer; and Veslekari) 5153 



advantages 5153 



Boat-sheet soundings from 3433 



Depth unit to be used with 3112(d) 



General description 422 



Hammer type 3115c 



identified in Descriptive Report 842C 



index adjustment (see also Index adjustment, 

 echo-sounding instruments) 



by bar check 557 



Facilities for .* 554 



Inoperative , noted in Sounding Record. . 815(7i) 



installation (see also under name of specific 



instrument) 54 



Factors to be considered in 54 



Semiportable 544 



Instrumental data required in Sounding 



Record 8132 



instrumental error (see also Instrumental 



error)... 552 



maintenance and tests (table Bl) 572 



Marconi Company 5324 



"fig ] If, 



MSclass 5322 



not functioning temporarily 3542 



observed continuously 3415 



operated at non-calibration motor speed, cor- 

 rections for 8223 



operation 



Gain-control adjustment 57(o) 



Instructions, specific... 57 



Instructions (table SI) 572 



Motor speed, maintaining.. 57(6) 



Precautions required 57 



Theory of 511 



operator (see Fathometer attendant) 



Principal parts 516 



Principles, general 511 



Reading depths on , precautions in 57(c) 



registering device (see Registering devices) 



Semiportable installation 544 



Sounding Record, data required in 8132 



speed (see Motor speed) 



Striker type 3115c 



tests and maintenance (table £1) 572 



Tide adjustment 56 



f52 

 Two , advantages K^^ 



Two , using 545 



Type governed by conditions 52 



Types, general 511 



Types used by the C. & O. Survey 52 



Use of -_. 515 



Velocity calibration (see Velocity calibration) 

 Veslekari (see Veslekari) 



Visual 5153 



in irregular steep bottom," registration 



of 57(i) 



Missing critical depth on (example) 57(d) 



Multiple echoes mistaken for true depth 57(e) 



E D on chart, investigation of 172 



Eddies, Coast Pilot requirements 916 



Eddies, dangers and shoals disclosed by 3623a 



Edition, Coast Pilot (see Coast Pilot, new edi- 

 tion) 



Edition date, on charts, definition 1122 



Eells, A. F 512 



808 Fathometer {523^ 



acoustic unit ("fish") 523 



installation {ftlOS 



amplifier, echo 5232 



Voltage produced 5232 



batteries 5235 



Care. 5235 



Charging 5235 



Bottom relief from fathograms fig. 117 



Care 5237o 



circuit diagram fig. lOS 



Cleaning 52376 



compared with Simplex-Bludworth Fathom- 

 eter. 5223 



Page 

 500 



500 

 501 

 500 

 502 



448 

 448 

 258 

 192 

 324 

 193 



526 

 514 



766 



503 

 503 

 505 



759 



510 

 551 

 502 

 546 

 547 

 501 

 272 

 252 



773 



542 

 542 

 551 

 543 

 542 

 438 



449 

 437 

 543 



505 

 759 



193 

 551 

 528 

 455 

 506 

 506 

 455 

 439 

 455 

 446 



448 



543 

 543 

 543 

 56 



439 

 443 

 462 

 463 

 469 

 470 

 465 

 465 

 469 

 469 

 469 

 545 

 471 

 467 

 472 



