Patent GB-191513614-A (GB)
Title: Improvements in and relating to Electric Selective Devices.
IPC: H04L15/16
Filed: 1915-09-24
Abstract: 13,614. Morse, A. H., and Indo European Telegraph Co. Sept. 24. Electric selectors.-In a selector comprising a number of electro-magnets operated by currents corresponding to the dots and dashes of a code signal, the closure of the controlled circuit is also dependent on the non-operation of a number of magnets corresponding to the spaces in the code. Construction. In the arrangement shown in Fig. 2, a number of electro-magnets EM<1> &c. and a magnet t are mounted on a disk l adapted to revolve about a fixed pillar m. On a constantly revolving disk q are mounted two magnets x the armatures of which, when attracted, cause members x<1> to engage a disk x<2> carried by the sleeve of the disk l, thereby causing the disk l to revolve. The disk q is provided with an annular mercury trough q<1> and a ring of felt q<4>, by means of which it can frictionally drive a disk s when this is brought into contact with the felt ring q<4> by the energization of the magnet e. The disk s is provided with a dipping contact s<1> and a weight s<2> for restoring it to its normal position, and is mounted on the armature d of the magnet e, the armature d also carrying a contact d<1> adapted to engage a fixed contact c<1>. The armature t<3> of the magnet t is provided with a projection adapted to engage a recess in a fixed locking-disk w, and carries a contact t<4> adapted to engage a fixed contact t<5>. Each magnet EM<1>, ES<2>, EM<2>, &c. is provided with a contact arm g adapted to engage one of the two contacts h, i, and is normally held in engagement with the contact h by a latch f, which is released by the energization of a magnet EM'. The contacts h, i are arranged to be connected to the controlled circuit by a hand-operated switch j, whereby a particular code is set up. The magnets EM' &c. are arranged around a portion of the periphery of the disk l, and a contact, provided for each magnet, is adapted to be engaged by a contact c mounted on a pillar p. After the operation of the apparatus, the contact-arms g are restored to their normal position by engagement with an arm o mounted on a pillar p<1>, and the disk l is again locked after a complete revolution by the locking-disk w. During the revolution of the disks l, q, connexions with the external crcuits of the apparatus are maintained by brushes v<1>, t<1>, q<3>, z, q<5> engaging contact rings v, t<2>, q<2>, z<2>, q<6> respectively. In the modification shown in Fig. 4, the contacts h, i, Fig. 2, are replaced by spring contacts I, II adapted to be engaged by plate contacts G, which are set by the magnet E and restored to their normal positions by a magnet E'. Operation. The connexions of the various parts of the apparatus are shown in Fig. 1, in which the nine magnets EM<1>, ES<1>, .. EM<6>, mounted on the periphery of the disk l, Fig. 2, are set to the code of the letter V by the switches j, the magnets EM<1>, EM<2>, EM<3> being dot magnets, the magnets ES<1>, ES<2>, ES<3> being space magnets, and the successive magnets EM<4>, EM<5>, EM<6> being dash magnets. One end of each of the windings of the magnets EM<1>, ES<1> .. EM<5> is connected to a corresponding contact M<1>, S<1> .. M<6> on the revolvable disk l, while the other ends of the magnet windings are connected to a battery b through a common lead, brush u, and pillar m. The contacts M', S<1> .. M<6> are adapted to engage a fixed brush c which is intermittently connected to the battery b through contacts c<1>, d<1> by the periodic energization of the magnet e by the code currents, thereby energizing the magnets EM<1>, EM<2> .. EM<6> but not the magnets ES<1>, ES<2>, ES<3>. The energization of the magnets EM<1> .. EM<6> causes their contact-arms g to disengage their contacts h and engage contacts i, whereby the circuit of a magnet k is completed across the battery b in series through the switches j, the contacts g, h of the spacing-magnets ES<1> &c., and the contacts g, i of the marking-magnets EM' &c. The energization of the magnet t, which unlocks the disk l and closes the circuit of the clutch magnet x, is brought about by the operation of the armature d of the magnet e, Figs. 1 and 2, which completes the circuit of the magnet t through the contact S<1> and mercury trough q<1> when the disk s is revolved. The alarm circuit C controlled by the magnet k may contain an electric horn or a lamp, and is provided with a hand-switch S. The arrangement may be used as a calling device in ordinary or wireless telegraphy.