| 摘要 |
524,829. Electric signalling systems. BRITISH WESTERN UNION, Ltd. Feb. 8, 1939, No. 4153. Convention date, Feb. 19, 1938. [Class 40 (i)] [Also in Groups XXXVI and XXXVII] A submarine cable-laying device of the kind described in Specifications 452,141 and 503,326, [both in Group XXXVI], is provided with means for transmitting to the cable-laying ship towing the device or other remote point indications of the tension in the cable as it passes through the device and also, preferably, indications of the angle at which the cable enters the device. The transmitting devices may comprise rheostats 35, 50, Fig. 2, mounted on the cable-laying device and actuated respectively by the lead of the cable as it enters the device and the pressure of the cable upon a pivoted guide roller as it passes through the device. The rheostats are connected by the conductors 90, 91 of a pilot cable, which connects the ship and the cable-laying device, to indicating instruments 95, 96 on board the ship, the instruments being connected in circuit with a battery 92 and ballast resistances 94. The circuits from the battery to the rheostats are completed through the water in which the cable is being laid. The rheostats may be of the construction described in Specification 524,828, [Group XXXVI]. The rheostat 35, Figs. 3 and 4, is operated by links 37, 38 which are controlled by a feeler 40 engaging the cable C as it enters the bell-mouth 24 of the device, the feeler pivoting about an axis 43 as the inclination of the cable varies. The rheostat 50, Figs. 3 and 8, is controlled by the pressure exerted by the cable on a guide pulley 27, the pulley rotating on axle 68 which is pivoted about an eccentric axis 68a. A spring 71, Fig. 4, urges the axle 68 about the axis 68a in one direction, whilst the pressure of the cable on the pulley 27 urges the axle in the opposite direction, so that the angular position of the axle relatively to the axis varies with the tension on the cable. A linkwork 52, 53, 55 transmits the relative movement to the spindle 51 of the rheostat 50.
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