Page- 902 



INDEX 



Reference 



Dorsey Fathometer No. 1— Continued. ^''• 



index adjustment 5541 



index disli. . ^ 5243 



indicator cabinet, parts included in 5243 



indicator, description 5243 



installation -. 541 



Cables 541 



Echo amplifier 541 



Filter junction box 541 



Indicator 541 



Power supply 541 



Transceiver. _ 541 



key circuit, operation 5243 



motor speed, controlled by tuning fork 5551 



operating cycle -. 524 



operation {^|^5 



parts 524 



power supply 5244 



Preparation for sounding 5245 



registering device 5243 



Separation effect. 556 



sounding interval 524 



speed of dial rotation .'•243 



Stroboscope operation 5243 



synchronous motor, description 5243 



synchronous motor, operating precautions. _. 5245 



Synchronous speed, how attained 5245 



transceiver 



Description 5241 



Frequency 5241 



installation fig. 105 



location, factors affecting 541 



power supply 5241 



tuning fork control 5243 



Dorsey Fathometer No. 2 (525^ 



compared with other echo-sounding instru- 

 ments 525 



depth range 5135 



depth scales 525 



Description 525 



First use of 5135 



index disk 525 



operation 525 



speed of rotation 525 



installation 542 



Indicator 542 



Sonic echo amplifier 542 



Strays 542 



superseded by Dorsey Fathometer No. 3 525 



Dorsey Fathometer No. 3 (see also Dorsey Fath-r5136 



ometer No. 1 \526 



Acoustic noises, troublesome, identifying 5267(r) 



acoustic units table I4 



Adjusting and testing 5267(a) to 



amplifier, echo 5262 



circuit voltages table 18 



Description 5262 



Echo-listening circuit 5262 



Operation, electrical 5262 



parts table I4 



"shoal-deep" switch 5262 



Sonic , installation 542 



Testing and adjusting 5267(/) 



Tuning 5267(« 



amplifier, power 5261 



circuit diagram __ fig. 107 



circuits table 14. 



Keying 5542 



Rectifier table H 



compared with other Fathometers 526 



depth range . i^^^ 



depth ranges , settings for table 15 



depth scales 5263 



depth-selector switch, function : 5263 



Description 526 



Development of 526 



Draft measurement reference point 551 1 (c) 



Electric noises, troublesome, identifying (5267 tS^ 



exciter lamps, testing and adjusting 5267(6) 



filter 5261 



First use of 5136 



Fuse capacity 5265 



hydrophones, testing and adjusting 5267(p) 



index adjustment /f?^^ 



(554 J 



Identifying controls for 1^^*^, , , 



[fig. Ill 



Methods 5542 



100-fathom dial 5542 



JiOOO-fatbom dial--„, -.-,,,,,. 5542 



514 

 476 

 475 

 475 

 503 

 504 

 503 

 504 

 503 

 503 

 603 

 476 

 520 

 473 

 474 

 477 

 474 

 477 

 477 

 475 

 525 

 474 

 476 

 476 

 475 

 477 

 477 



474 

 474 

 475 

 503 



475 

 477 

 442 

 478 



478 

 442 

 478 

 478 

 442 

 478 

 478 

 478 

 504 

 504 

 504 

 504 

 478 

 442 

 478 

 495 

 489 

 (r) 493 

 482 

 493 

 482 

 482 

 482 

 489 

 482 

 504 

 494 

 494 

 482 

 481 

 488 

 515 

 488 

 478 

 442 

 478 

 490 

 483 

 483 

 478 

 478 

 508 

 495 

 495 

 493 

 479 

 442 

 485 

 495 

 483 

 515 

 515 

 515 

 516 

 516 

 516 



Dorsey Fathometer No. 3— Continued. Reference 



index adjustment -continued. N"- Page 



procedure, first method.. {f^^ ^^ 516 



procedure, second method 5542 516 



Separation error accounted for in 556 526 



index disk (s)... 5263 483 



Functions... 5243 476 



speeds of rotation. 5263 483 



indicator 5263 482 



cabinet, description 5263 482 



cabinet, principal parts in... 5263 483 



circuit voltages tablets 492 



installation 542 504 



parts and circuits table 14 488 



installation 542 504 



(5263 483 



keying circuit(s) ■{5264 484 



(5542 515 



operation 5264 484 



parts table li 488 



Sonic , adjustment 52e7(d) 493 



Sonic , testing and adjusting 5267(d) 493 



Supersonic , adjustment 5267(c) 493 



Supersonic , testing and adjusting 5267(c) 493 



motor speed controlled by tuninig fork 5551 520 



motor, starting tableli 489 



Testing and adjusting 5267(0, (fc) 494 



motor, synchronous (see also Synchronous 



motor under Dorsey Fathometer No. 



1) tableli 489 



Testing and adjusting 5267(!), (fc) 494 



neon-tube circuits 5263 483 



100-fathom scale, operation 5263 483 



1,000-fathom cutout 5263 483 



1 ,000-fathom scale, operation 5263 483 



Operating procedure 5266 486 



Guide to /5266 487 



uumeto {table 15 490 



Importance of following 5266 487 



Operation 5266 486 



Faulty— .diagnosis...... --{5267(a) to (r)«3 



Faulty , tabular diagnosis . table 17 491 



Functional table 16 490 



oscillator .5261 482 



Testing and adjusting 5267(p) 495 



paralysis ranges 5266 487 



narts /52^ 479 



P"^"^- {table 14 488 



Power source for— {f265 ^^ 485 



p°---pp>y {fmen til 



circuit voltages tablets 493 



Description 5265 484 



housing _/52r5 484 



Xfig. lOS 485 



Testing and adjusting 5267(<7) 494 



Separation effect 556 525 



sonic echo amplifier installation 542 504 



Sonic transmission and reception, testing and 



adjusting 5267(7i) 495 



Strays 542 504 



Causes of 5267(1/) 495 



(5243 476 



stroboscopic system •j52C3 483 



15266 486 

 Switch (es), depth-selector and starting-fre- 

 quency 



circuits. table H 488 



[table 15 490 



settings -^5542 516 



[table 19 517 



Testing and adjusting 5267(/i) 494 



synchronous motor (see also under Dorsey 



Fathometer No. 1) 5263 483 



lubrication 5267(j) 494 



Operation precautions necessary {5266 486 



speed 5263 483 



Verifying 5266 486 



Table 15, explanation of 5266 487 



Table 16, explanation of 5266 487 



Table 17 (e.ramp;e) 5267 492 



Table 17, explanation of 5267 492 



Testing and adjusting 5267(a) to (r)493 



312 Fathometer used in combination with 



545 507 



Circuit arrangement of fig. 110 506 



Time lags in -: — 5542 515 



transceiver 



Description 5261 479 



Energizing 5261 482 



frequency 5261 479 



Operation 5261 479 



polarizing circuit, testing and adjusting 5267(o) 495 



