Patent GB-190303438-A (GB)
Title: Improvements in Relay Translation for Submarine Cables
Inventor: BROWN SIDNEY GEORGE
Filed: 1903-02-13
Granted: 1904-02-11
Abstract: 3438. Brown, S. G. Feb. 13. Telegraphs.-Relates to improvements in relay or translating devices used in submarine cable working, and comprises, in part, improvements i n the relay described in Specification No. 1434, A.D. 1899. The suspended coil of the relay is provided with a metal rod a<1>, Fig. 1, the ends of which are riveted to metal plates a<2>, a<3>, which clamp round the winding at the respective ends and carry the suspending attachments a<4>, a<5>. The coil is suspended by phosphor-bronze strips, and the attachment a<4> carries a short arm which plays between limiting-stops. The coil is coupled to the suspended relay tongue c, Fig. 2, by means of quartz fibres b. The iron armature or core of the coil is slotted to receive the centre post a', and when the coil is pivoted, the centre post is brought through the winding, terminating at the pivots. One of the suspending-strips may be clipped by a device which can be raised or lowered to vary the periodic time of vibration of the coils. The relay pointer may be tipped at c<1> with iron or steel &c., and may move across the surface of a divided plate d, also of magnetic material. By means of an alternating current passing through coils c<2>, the pointer is magnetized so as to set up vibrations which facilitate its movement. The relay pointer may also terminate in a curved plate which rolls on the surface of a divided contact-plate, which may also be pivoted and connected to the pointer crosswise by quartz fibres. The plate carried by the pointer c may be formed with projections or teeth adapted to engage with depressions on the two sides of the mica division of the pivoted contact-plate after the manner of spur gearing. When a revolving contact-drum is used, it is provided with a chamois-leather apron which rubs against the surface to remove dirt. In the arrangement shown in Fig. 4, the current from the battery e flows from the drum contacts d<2>, d3 through local relays f, f<1> and resistances g, g<1>. The local recording-device h is placed across the resistances. Fig. 5 shows a relay device with local correction circuits for restoring the length of the signals. This correction may be effected by means of an auxiliary coil b, consisting of a small additional winding on the moving part which carries the main coil a of the relay. An inductive shunt E is placed across the terminals of the coil a. A split battery i discharges through two equal high resistances k, k<1> the condenser l being bridged across the mid points i', i<2>. The resistances k, k<1> being connected with the battery i through the back stops and tongues of the relays f, f<1>, the movement of one of the relay tongues f<2>, f<3> disturbs the balance and produces a current in the auxiliary coil b. The front stops of the relays f, f<1> are connected with the dot and dash electromagnets K, K<1> of the interpolator or punch, separate batteries I, I<1> being provided for working these electromagnets. The reference letter C denotes the core of the cable, D the sheath, C', C', C<3> condensers, A the artificial line for duplex working, and L the transmitter. The relay may consist of a polarized electromagnet, the armature of which is supported by a knife-edge on an agate support and is normally held up by a spring pulling downwards on the rear end. Across the terminals of the main coil of the relay or of a siphon recorder may be placed a condenser, and also an inductive shunt placed in series with an adjustable resistance. In an alternative method of arranging the local correction of the cable relay, a split battery is connected to the two sides of the divided contact-drum through two polarized relays, and the auxiliary coil receives a shunt current through suitable inductances and resistances. Artificial lines may be constructed of inductance coils with resistance leaks. Fig. 9 shows a method of duplexing, in which such a device is used in parallel with the cable, the combination being balanced by a resistance u, which may also include capacity and inductance. Fig. 10 shows resistances and inductances in series, the resistances v having progressively diminishing values.