Jim- 14, 1947. J. B. RETALLACK 2,414,123 HYDROPHONE SELECTING SYS TEM Filed Nov. s, 1943 2 Sheets-Sheet 1 in FIG3 FIG. / ~ 5- @lvlili'r I; "\AQ § 6“ . 5g % % 1 l l N 1 pgagagp a) N) g) ‘ a.” a g ‘r I ‘ 'AVAVAJ 5) + g § lNVENTOR By .ji éETALAAC/f ATTORNEY Jan. 14, 1947. J. B. RETALLACK 2,414,123 HYDROPHONE SELECTING SYSTEM Filed Nov. 8, 1945 2 Sheets-Sheet 2 wt w INVENTOR J B. RETALLACK BY jvlm?c‘awlj A TTORNEY Patented Jan. 14, 1947 2,414,123 UNITED STATES PATENT OFFICE 2,414,123 ' ROPHONE SELECTING SYSTEM John B. Retallack, New York, N. Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application November 8, 1943, Serial No. 509,449 4 Claims. (01. 177-353) 1 _ . This invention relates to hydrophone selecting systems. More particularly, this invention is a hydrophone selecting system in which selection is effected by discriminating between both the po larities and magnitudes of electromotive forces 2 of key 2| are closed, a circuit may be traced from ground through negative battery 32, lamp 33, re sistance 20, contacts of key 2|, winding I6 of the secondary of transformer I3, conductor Illa, coil 40 of inductance 9|], windings of relays 42, 43, 44, 45 in series and recti?er 46 to ground I2. The impressed on conductors connecting a signaling station and a plurality of hydrophones. recti?er 46 is a, copper-oxide recti?er or the like. In the system herein a number of hydrophones, It is poled so as to o?er negligible resistance to not exceeding nine, are spaced along a two-con the ?ow of current from negative battery 32. It ductor submarine cable. Any one of eight of the 10 is particularly pointed out that the Voltage of nine hydrophone stations may be selectively con negative battery 32 is reduced by the effect of nected to a signaling station through the two resistance 20 connected in series in this circuit. conductor cable by impressing battery of a par The resultant voltage impressed on the windings ticular polarity and voltage of a particular one of relays 42 to 45 is such that relays 42 and 43 do of two magnitudes on a particular one of the two 15 not operate. The magnitude of the voltage is conductors. The ninth hydrophone station is su?'icient, however, to operate relays 44 and 45. normally connected to the signaling station when Although other selecting paths are connected to no battery or voltage conditions are impressed conductor Illa in parallel with the path through on the conductors and is disconnected when bat the windnigs of relays 42 to 45, no one of the other tery of either polarity and voltage of either mag 20 paths is effective to establish a selection at this nitude is impressed on the conductors. time for reasons which will be made apparent The invention may be understood from the fol below. lowing description when read with reference to A circuit may now be traced from the bottom the associated drawings in which: terminal of winding I6 through conductor Illa, Fig. 1 shows the left-hand portion of the cir 25 contact 48, contact 49, hydrophone I, contact 50, cuit of the invention; contact 41 and conductor Illb to the top terminal Fig. 2 shows the right-hand portion of the cir of winding I5 of the secondary of transformer cuit of the invention; and I3. Hydrophone I is thus connected to signaling Fig. 3 shows an alternative embodiment of the station I4. selecting mechanism at a hydrophone station. When the contacts of key 22 are closed, a cir Refer to Figs. 1 and 2. The conductors ex 30 cuit may be traced from ground through nega tending to the right-hand margin of Fig. 1 con tive battery 32, lamp 33, contacts of key 22, wind nect to the conductors extending to the left-hand ing I6, conductor I 6a, coil 5| of inductance 94, margin of Fig. 2 in corresponding positions. windings of relays 52 and 53 in series, resistance In Figs. 1 and 2, nine hydrophone stations num 54 and recti?er 55 to ground I2. It is pointed bered l to 9 are spaced along a two-conductor 35 out that resistance 20 is not connected in this submarine cable It, which is enclosed in an im circuit and that the magnitude of resistance 54 pervious sheath I I, which is grounded at I2. The is relatively small. The recti?er 55 is poled so two-conductor cable is connected through a trans as to pass current from negative battery 32. Re former I3 to a signaling station I4. The sec lays 52 and 53 are operated. A circuit may then ondary of the transformers comprises two wind 40 be traced from the bottom‘terminal of winding ings I5 and I6, the inner terminals of which are I6 through conductor Illa, contact 51, hydrophone connected through a condenser IT. The inner 2, contact 58 and conductor Illb to the top termi terminals of windings I5 and I6 are connected nal of Winding I5. Hydrophone 2 is connected to also to a selecting station I8. At the selecting the signaling station. Attention is called to the station there are eight keys 2! to 2B. The indi 45 fact that the polarities of recti?ers 46 and 55 vidual operation of keys 2| to 28 effects the in are the same so that when key 22 is pressed, a dividual selection of the eight hydrophone sta path is also established through the windings of tions I to 8 by impressing either full or reduced relays 42 to 45. Since resistance 20 is removed positive battery 30 or full or reduced negative from the circuit the magnitude of the voltage im battery 32 on the individual selecting apparatus 50 pressed across the relay windings is such that all sealed in the submarine cable at each hydrophone of relays 42 to 45 operate. Contacts 41 and 48 station. are open and hydrophone I is disconnected from The manner in which the system per Figs. 1 the line. and 2 functions will now be described in detail. When the contacts of key 23 are closed, a circuit Refer now to Figs. 1 and 2. When the contacts 5.5 may be traced from ground through positive bat 2,414,123 tery 30, lamp 3|, resistance I9, contacts of key 23, coil I6, conductor Ilia, coil 60 of inductance 98, windings of relays 62, 63, 64, 65 in series and recti?er 66 to ground I2. The recti?er 66 is con nected into this path in such manner that it pre sents a low resistance to current from positive 4 battery 30, lamp 3|, resistance I9, contacts of key 21, winding I5, conductor I?b, coil IQ!) of inductance I25, winding of relays I22, I23, I24, I25 and recti?er I26 to ground I2. Recti?er I26 is connected into the selecting path in such man ner as to present a low resistance to current from positive battery 39. It is pointed out that battery 39. It is pointed out that resistance I9 resistance I9 is connected in series with the wind is connected in series in the path extending ings of relays I22 to I25. The magnitude of the through the windings 62 to 65. The magnitude of the potential of battery 30 is thus reduced. 10 voltage impressed across the windings of relays The potential impressed on the relay windings I22 to I25 is such that relays I24 and I25 operate. Relays I22 and I 23 remain released. A circuit 62 to 65 is such that relays 64 and 65 operate. may then be traced from the bottom terminal Relays 62 and 63 remain in the released condi tion. A circuit may then be traced from the bot of winding I8, conductor Illa, contact I29, con tom terminal of winding I6, conductor Illa, con tact 69, contact ‘Ill, hydrophone 3, contact 68, 15 tact I 38, hydrophone ‘I, contact I28, contact I21 and conductor I?b to the top terminal of winding contact 61 and conductor I01) to the top terminal i5. Hydrophone l‘ is thus connected to signaling of winding I5 connecting hydrophone 3 to se station I4. lecting station I4. When the contacts of key 28 are closed, a cir When the contacts of key 24 are closed, a cir~ 20 cuit may be traced from ground through posi cuit may be traced from ground through positive tive battery 30, lamp 3|, contacts of key 28, wind battery 30, lamp 3I, contacts of key 24, winding 16, conductor Iila, coil 80 of inductance I92, windings of relays 82 and 83 in series, resistance ing I5, conductor Ilib, coil I40 of inductance E95, windings of relays I42 and I23, resistance I54, and recti?er M5 to ground I2. The polarity oi 24 and recti?er 85 to ground l2. Recti?er 85 is poled so as to present a low resistance to current from positive battery 35. Attention is called to the fact that resistance i9 is not connected in recti?er I45 is such that. it o?ers a low resistance A circuit may then be traced from the bottom from the bottom terminal of winding l6, con terminal of winding I5, conductor Iila, contact 8?, hydrophone 13, contact 86 and conductor It?) to the top terminal of winding I5. Hydrophone 4 is thus connected to signaling station I4. ductor I (la, contact I41, hydrophone 8, contact to current from positive battery 30. The magni tude of resistance I4‘; is small. It is pointed out that resistance I9 is not connected in the path the selecting path extending through the wind through the windings of relays I42 and i433. Sub ings of relays 82 and 83. The magnitude of re 30 stantially the full potential of battery 35 is im sistance M is small. Substantially full potential pressed across the windings of relays I42 and of battery 30 is impressed across the windings I43 which operate to connect hydrophone 8 to of relays 82 and 83. Relays 82 and 83 operate. signaling station I4. A circuit may be traced When the contacts of key 25 are closed, a cir cuit may be traced from ground through negative battery 32, lamp 33, resistance 20, contacts of I46 and conductor It?) to the top terminal of winding 515. When no potential of either polarity and of either magnitude is impressed on either one of conductors Ella and Ilib, hydrophone 9 is con nected to signaling station Eli. A circuit may be traced from the bottom terminal of winding 56 key 25, upper winding I5 of the secondary of transformer I3, conductor Iilb, coil I62 of induct through hydrophone conductor 9, contact Hm, I51, contact contact 258‘, I55 contact and con ance I63, windings of relays I55, I55, I67, I68 and recti?er I69 to ground I2. The recti?er I55 is _, ductor IBZ) to the top terminal of winding i5. poled so as to offer a low resistance to current When potential of either polarity and either from negative battery 32. The full voltage of bat magnitude is impressed on conductor I?a, a cir tery 32 is reduced by the effect of the resistance cuit extends through coil lQl of inductance Hi8 20 which is interposed in the series circuit. Re and the windings of relays I53 and £54 to ground lays I55 and IE5 remain in the released condition 50 I2 operating relays i513 and I54. This discon and relays i5‘! and IE8 operate. A circuit may nects hydrophone 9 from signaling station H. then be traced from the bottom terminal of wind When battery of either polarity and either mag ing is through conductor IIJa, contact H2, con nitude is impressed 0n conductor l-Lb, a circuit tact I173, hydrophone 5, contact I‘II, contact I?!) extends through coil I55 of inductance W8 and and conductor It?) to the top terminal of winding the windings of relays 552 and I55 to ground t2 l5. Hydrophone 5 is connected to signaling sta operating relays I52 and I55. Contacts I55 and tion [4. I59 are opened, disconnecting hydrophone 9 from When the contacts of key 26 are closed, a cir signaling station I4. cuit may be traced from ground through negative From the above, it should be apparent that battery 32, lamp 33, contacts of key 25, winding the invention herein is a system wherein any one 15, conductor IDb, coil IBl) of inductance H5, windings of relays H2 and H3, resistance iii and recti?er H5 to ground I2. Recti?er H5 is of nine hydrophone stations may‘ be selected for connected into the circuit in such manner as to o?fer a low resistance to current from negative battery 32. The magnitude of resistance IM- is low. Substantially the full voltage of battery 32 is impressed across the windings of relays H2 and H3 to close the circuit to hydrophone 6. This circuit may be traced from the bottom ter minal of winding I6 through conductor ma, con— tact H'I, hydrophone 6, contact IIS and- con ductor IGb to the top terminal of winding I5. When the contacts of key 2? are closed, a cir~ connection to a signaling station over a two-con ductor cable. One of the nine stations is nor mally connected to the cable and is disconnected 65 automatically when any of the other eight sta tions is selected. Four of are selected by impressing battery on one of the two remaining four of the eight these eight stations positive or negative conductors and the stations are selected 70 by connecting positive or negative battery to the other of the two conductors. Of the four sta tions selected by impressing positive or negative battery on a particular conductor, two are selected by impressing positive battery on the hydrophone cuit may be traced from ground through positive 75 selecting mechanism and the remaining two are 2,414,123 5 . selected by impressing negative battery on the selecting mechanism. Of each of the two sta tions in each group of four selected by positive battery, one is selected by positive battery of high of said eight hydrophones to both of said two conductors. 2. A system in accordance with the preceding claim including a ninth hydrophone having an potential and the other by positive battery of individual selecting mechanism, means for con low potential. Of the two stations in each group necting said ninth hydrophone e?ectively to said of four selected by negative battery impressed on conductors when none of said eight hydrophones a particular conductor, one is selected by nega is e?ectively connected to said conductors and tive battery of high potential and the other by means for effectively disconnecting said ninth negative battery of low potential. 10 hydrophone from said conductors when any of Refer now to Fig. 3. Fig. 3 shows an alterna tive selecting arrangement for a hydrophone at a particular selecting point. Electrically, it cor responds to the‘arrangement shown for selecting station I in Fig. 1. Instead of ordinary relays, however, in Fig. 3 each individual pair of relay contacts is enclosed in an individual seal such as said eight hydrophones is effectively connected to said conductors. 3. In a submarine cable hydrophone selecting system, a cable having a ?rst and a second con ductor enclosed in a grounded impervious sheath, eight hydro-phones distributed along said cable, a ?rst four selecting circuits each having the winding of a high potential responsive relay and an envelope of glass or the like. Relays having such contact protective arrangements are well a recti?er in series, each of said circuits connected known in the art. The employment of relays 20 individually between said conductors and said having contacts enclosed in separate impervious envelopes, in addition to the impervious sheath sheath, two of said ?rst four circuits connected effectively to each of said conductors, a second which encloses the cable conductors. and the four selecting circuits each having the winding selecting mechanism, provides additional protec of a high potential responsive relay, the winding tion against failure due to moisture and ?ne silt, 25 of a low potential responsive relay and a recti?er etc. in series, each of said second four circuits con What is claimed is: nected individually between said conductors and 1. In combination in a hydrophone selecting said sheath, two of said second four circuits con system, a submarine cable having a grounded im nected effectively to each of said conductors, pervious sheath, two conductors only in said cable, 30 sources of positive and negative high and low eight hydrophones spaced individually along said potential, a ?rst four control means for impress ing said potentials selectively on said ?rst con ductor, a second four control means for impress connected to a ?rst one of said conductors, four ing said potentials selectively on said second con individual selecting mechanisms for a second four 35 ductor, means comprising the poling of said rec cable, four individual selecting mechanisms for a ?rst four of said eight hydrophones effectively of said eight hydrophones effectively connected ti?ers, responsive to the actuation of any par to a second one of said conductors, a high voltage ticular one of said control means for actuating a corresponding one of said selecting circuits, and means responsive to the actuating of said enabling relay and a low voltage disabling relay in a ?rst two of each of said four mechanisms, a high voltage enabling relay in a second two of 40 selecting circuit for connecting a corresponding each of said four mechanisms, a single recti?er one of said hydrophones between said ?rst and in each of said eight mechanisms and an in said second conductors. dividual circuit for each of said mechanisms, said 4. A system in accordance with claim 3, a ninth circuit extending from said grounded sheath hydrophone, a ninth selecting circuit and means through said recti?er and through an individual 45 in said ninth selecting circuit for connecting said winding of all of the relays in an individual mech ninth hydrophone between said ?rst and said anism all in series, responsive to voltage of one second conductor when no potential is impressed of two magnitudes and of a particular polarity on either of said conductors. impressed on one or another of said two con ductors, to selectively connect any particular one 50 JOHN B. RETALLACK.