INDEX 



Page 903 



Reference 

 Dorsey Fathometer No. 3— Continued. ^°- 



Transmitted signal, adjustment 5264 



Transmitted signal, shortening. __ 5264 



transmitter, 17.5 kc, testing and adjusting.. 5267(to) 

 tubes 



Gas discharge , testing and adjusting... .5267 (/) 



Neon , testing and adjusting 5267(f) 



Photoelecric , testing and adjusting 5267 (o) 



tuning fork and circuits 5265 



tuning-fork current, testing and adjusting... 5267(A) 



tuning-fork vibration 5267(fc) 



20-fathom scale, operation 5263 



Veslekari used in combination with 545 



Voltage of circuits table 1 8 



Dorsey, Herbert Grove 512 



Dorsey hydrophone (see Hydrophones, sono- 

 radio buoy, Dorsey) 



Dory, description, dimensions, and use 4242 



Dory-skiff, description 4245 



{EC] 

 5511 



Description . 5511 



scale 5511 



Setting scale of 5511 



used in determining draft of acoustic unit 5511 



Drafting 



{721 

 933 



Inked lines solid and uniform.. 723 



instruments 



Care 48 



Custody 48 



Stowage 48 



Line width gage (illustTation) 962 



machine, universal 4851 



materials 



Requisitioning 486 



to be requisitioned by letter 486 



to be requisitioned on Form 11a 486 



Pen points recommended for 725 



room 



of a survey ship 4113 



Furniture in 4113 



Illumination of 4113 



of the Erplorer 4122 



Smooth sheets, and lettering on 72 



Draft marks, external, of vessel used in deter-f551 



mining draft of acoustic unit. ...\5511 



Draft of acoustic units 551 



(55 



Adjustment for •i551 



15512 



312 Fathometer 5543 



Allowing for , method of . 551 



Definition 1 5511 



Mea.surement of 5512 



Accuracy g}| 



facilities {^^}l 



Frequency 5513 



Factors determining 5513 



{'5 '512 

 8132 



Reference point in unit for 5511 



Dorsey Fathometer No. 1 5511(6) 



Dorsey Fathometer No. 3 5511(e) 



808 Fathometer 5511(e) 



MS 12 D 5511(d) 



312 Fathometer 5511(a) 



Veslekari 5511(d) 



using existing draft marks or gages 5511 



(5511 

 5512 



using reference points on deck 5511 



using reference points on ship's rails 5512 



Drags to slow down sounding launch 3461 



Drawing ink (see Ink, drawing) 

 Drawing paper (see Paper, drawing, and 

 Smooth-sheet paper) 



Dredged shoals, least depths to be verified 3523 



Dredging projects 916 



Drift soundings 



Recording , method of 3312(e) 



Time spent in recorded in Sounding 



Record /^^'^(e) 



Kecora \815(ft) 



used to find least depths 3664 



Drop bow pen _.. 4841 



Dumb compass (see Pelorus) 



DuPont "SSS" detonators. 667 



484 

 484 

 494 



493 

 493 

 493 

 485 

 494 

 494 

 483 

 506 

 493 

 440 



327 



328 

 507 

 508 

 508 

 509 

 509 

 509 



663 



418 

 418 

 418 

 882 

 433 



436 

 436 

 436 

 665 



317 

 317 

 317 

 320 

 663 

 508 

 509 

 507 

 507 

 507 

 510 

 517 

 507 

 507 

 508 

 509 

 509 

 510 

 507 

 508 

 510 

 510 

 510 

 759 

 508 

 508 

 508 

 508 

 508 

 508 

 508 

 509 

 508 

 509 

 508 

 509 

 264 



270 

 837 



213 



766 

 284 

 432 



E 



Reference 



No. Page 

 East Coast sono-radio buoy (see also Sono- 



radio buoys. East Coast) €52 604 



Eccentric stations, marking 2263(/) 80 



Echo(es) (see also Reflection of sound) 



Comparison between in water and air... 511 437 



Failureof from steep slopes 571d 546 



Irregular bottom, from . 563 542 



Multiple 5i4fi 445 



Definition 514G 445 



Eliminating 514G 445 



Mistaking for correct depth 57(e) 543 



Reflection of 



from irregular bottom se.'* 542 



from steep slopes 563 542 



Side (see Reflections of sound from bot- 

 tom slopes) 

 Echo amplifiers (see Amplifiers, echo, and un- 

 der name of specific instrument) 



Echo-listening circuit 5262 482 



Echometre 5312 600 



Echo receiver (see Receiving units, acoustic) 



Echoscope 5313 501 



Echo signal, transmitted, length of 511 437 



Echo signal, variation in strength of 



Causes 552 510 



Effect on soundings 552 510 



Echo sounding(s) (see also Fathogram) 



Accuracy 511 438 



Advantage of method 511 438 



Aeration, effect on 5143 444 



Analogy to distance measurement in air 511 437 



Bottom characteristics obtained during . 3842 302 



Collateral uses 512 441 



Conditions influencing 514 443 



(55 507 



Corrections to . ^56 527 



18223 772 



Calibration velocity . 6311 575 



Draft 551 507 



mechanically applied 562 539 



Separation effect (formula) 556 525 



Settlement and squat , when made 570) 543 



Slope of bottom 56 528 



Formula . 563 540 



from navigator's viewpoint 563 542 



Impracticability of applying 563 541 



in irregular bottom 563 541 



in submarine canyons, difficulty of ap- 

 plying 5£3 541 



Methods of applying 563 541 



not applied in field 563 542 



Principle of applying 563 541 



Submarine topography must be known 



in detail 563 540 



Tide , instrumental application during 



sounding 56 528 



Tide , methods of applying 56 527 



Types of required 56 527 



Variable 56 528 



Variation of sensitivity 571a 544 



Velocity («ee Velocity of sound correc- 

 tions) 



cycle, description 511 438 



Depth measurement by 511 437 



Depth range 511 438 



development, an outgrowth of distance meas- 

 urements 611 555 



development, chronology of 512 440 



development during W orld War I 512 440 



Earliest attempts at 512 439 



Effective bottom path covered (/ormii/o) 563 540 



808 Fathometer corrected for index ad- 

 justment 5545 519 



equipment of the /r:xp?orer 4122 320 



errors due to bottom slope 563 540 



expedients 58 552 



Sounding with bombs (see also Bombs, 



sounding with) 582 552 



used in emergencies 58 552 



using 312 Fathometer unconventionally 581 552 



fluctuating rapidly, how recorded 57(/) 543 



frequency requirements 3433 258 



for irregular bottom 3415 252 



General statement 51 437 



History of development 512 439 



in C. & O. Survey 513 441 



Ideal medium for 514 443 



in irregular bottom 



Direct measurements to supplement 563 541 



