Patent GB-189901103-A (GB)
Title: Improvements in Telautographs.
Inventor: NEWTON PHILIP ARTHUR
Filed: 1899-01-17
Granted: 1899-02-25
Abstract: 1103. Newton, P. A., [Gray National Telautograph Co.]. Jan. 17. Telegraphs. - Relates to arrangements of the selecting and driving apparatus at the transmitting and receiving stations by which, with the use of two lines, one for each of the pen arms, the transmitted succession of impulses in one sign are converted into impulses of alternating polarity for operating the recording-pen at the receiving-station. Other details of the apparatus are also described. Figs. 1 and 2 show one arrangement of the apparatus, in which Fig. 1 is the transmitting-station and Fig. 2 the receiving-station. In Fig. 1, 5 is a master switch, and Z, Z' a split battery connected to the reversing contact-makers carried by the Prony brakes 6, 6<1>. 7, 7<1> are the ordinary makes and breaks for sending the impulses to line according to the motion of the pen arms 1 and 2. The paper table 8 is provided with the receiving-pen lifting-contacts, and is arranged so that, when the pen is off the table, a weak current is on the line through the resistance R, but,-while transmitting, either the resistance R is shunted or the resistance R<1> is to line. The other pen arm 2 is provided with one resistance R' only. Fig. 2 shows a bridge arrangement of the circuits at the receiving - station. The bridge in each line is arranged with non-inductive resistances R<3>, R<4> in two arms, the pen relay I in a third arm, and a relay F in the fourth arm for controlling the motion-reversing magnet H. The escapement E is controlled by the relay D placed in the diagonal. M is the paper-feed magnet, which is only operated when the line circuit is broken at the transmitting-station by moving the master switch. The paper-feed axle also carries the rotating switch 27. Several modifications of the escapement and reversing arrangements are described, such as forming the armature of the double magnet E with contact-springs arranged to break the circuit of each magnet as soon as the armature has been attracted to that magnet ; the escapement pawls are also spring-mounted and provided with limit stops. In this form, the reversing-magnet acts through clutch bevel gear, and a unison stop is arranged on the pen arm so that a contact is opened in the escapement circuit as soon as the pen is allowed to move to its position of rest. Several forms of double and single escapement pawls are described for reversing the direction of the motion of the pen arm by causing the pawls to feed in both directions. The position of the pawls may be shifted by means of a spring connection controlled by the magnet H, or an oscillating guide may be employed for ensuring proper engagement of the pawls with the escapement-wheel. A further modification is described in which the currents controlling the direction of motion are low-tension direct currents, whilst the currents controlling the amount of motion are high-tension alternating currents. In this form, the transmitter is arranged with an induction coil and divided battery in each line, and the receiver bridge is arranged so that one arm shall suppress the induced currents, the other arm being of too high ohmic resistance for the low-tension direct currents. The driving-escapement, in this form, is direct from the armature pawls, the reversal of motion being obtained by means of a single or double guide-pawl on the armature of the magnet H. The pawl on the armature of the magnet H may engage with the escapement-wheel or with an auxiliary wheel having double the number of teeth.