Patent GB-245135-A (GB)
Title: Improvements relating to electric distant control and signalling apparatus
IPC: G08C19/24
Filed: 1925-12-22
Abstract: 245,135. Schneider et Cie. Dec. 27, 1924, [Convention date]. Order apparatus.-In a system for transmitting orders to a distance or controlling apparatus such as guns, synchronous motors at the transmitting, and receiving stations drive contact mechanisms which co-operate in such a manner that when a contact brush at the transmitter is set into a position corresponding to the order to be transmitted, indicating apparatus, such as telephones, lamps &c. are rendered operative until the receiver brush is adjusted manually, or by an electric motor, into the position of coincidence. The orders or the control operations may be transmitted over line wires or by wireless. Fig. 1 shows a system in which the tranmission is effected by wireless. Synchronous motors at the transmitting and receiving stations drive shafts 1, 2 which carry rotary switches co-operating with brushes 4, 8. The brushes are mounted on discs which are adapted for rotation by handles 5, 9 respectively. The switch at the transmitting station has a, contact 3 which, when it co-operates with a brush 4, causes the transmission of a wave which is modulated by the action of a tuning fork 19 upon a microphone 20. The switch at the receiver has two contacts 6, 7 connected respectively to telephones 22, 21. When the brushes 4, 8 are in the positions shown, no circuit is established for either of the telephones, but when the brush 4 is displaced, one or other of the telephones is actuated depending upon the direction of displacement. The brush 8 is then adjusted by the handle 9 until no sound is heard in the telephone. Under these conditions the position of the brush corresponds to that of the brush 4. The apparatus may be modified for transmitting coarse and fine adjustments. These adjustments are transmitted by two transmitters which produce different wave lengths having different modulations. The transmitters may have a common aerial and a common driving motor. At the receiving station, two rotary switches are connected to circuits tuned to the different wave lengths. The telephones may be replaced by electric lamps of different colours or by relays controlling an electric motor to operate the handle 9 and brush 8. Instead of wireless transmission, a generator having an audible frequency may be connected in a line wire extending between the brushes 4, 8, and the telephones 21, 22 may be connected to the contact 3. Alternatively, a continuous current generator may be connected between the brushes and the telephones may be replaced by differently coloured lamps. Fig. 2 shows a further modification wherein the transmission is effected over line wires. Switches at the transmitting and receiving stations having contacts 30, 31 and 34, 35 respectively are rotated synchronously. The movable brushes 32, 36 are connected to the armature 43 of a motor the field of which is permanently excited. The motor which controls the position of the brush 36 is rotated in one direction or the other depending upon the setting of the brush 32, until the brush 36 is moved into the position of coincidence. The motor may be replaced by a polarized relay which operates signalling devices and the brush 36 may be adjusted by hand. The apparatus shown in Fig. 2 mav also be adapted for wireless transmission. The brushes 32, 36. are connected to the transmitting and receiving aerials respectively and the contacts 30, 31 to generators of different wave lengths. The contacts 34, 35 at the receiver are connected to circuits tuned to the two wave lengths and to telephone receivers. The Specification as open to inspection under Sect. 91 (3) (a) states that wave modulation may be effected by a rotatable condenser and that the switches may be so arranged that coincidence is indicated by the equality of duration of the sounds heard in the telephones. A system for ensuring synchronous operation of the switches also was described imperfectly. This subject-matter does not appear in the Specification as accepted.