Patent GB-744168-A (GB)
Title: Electrical means for the remote observation of air or water craft or land vehicles
IPC: G01C21/22
Filed: 1952-11-24
Abstract: 744,168. Electric indicating systems. SCHMID, W. K. Nov. 24, 1952 [Nov. 24, 1951], No. 29685/52. Class 40(1) Control operations performed by the pilot of an air, land or water craft or the - indications of measuring instruments responsive to manoeuvres effected thereby are radio transmitted to aground station by means of specific frequencies associated arbitrarily with discrete steps of a continuously movable control lever or instrument responsive device. The transmitted frequencies may be recorded at the receiver or directly operate indicators in synchronism with the control lever. Transmitting control column movements. Fig. 6. Fore and aft movement of an aircraft control column 1 for aileron control, rotates, through gearing a radial arm 60 which rotates a wiper arm 9 through an abutment 61 for movement in the direction of arrow A. For reverse movement in direction B the'arm 60 first stresses a biasing spring 62 and then engages a contact 63 to drive the arm 9. The contact arm, 9 wipes over a selector disc 10 having a series of contact segments (three only c, e. g are shown), whereby corresponding frequencies derived from a generator 14 are fed to a radio transmitter 16. For reverse movement in direction B a further control frequency is transmitted by closure of contact 63, by the arm 60. Receiver. Fig. 7. The received frequencies after demodulation and amplification actuate corresponding frequency sensitive relays FR1, FR2. FR3 ... the last relay FR4 responding when the reverse contact 63 is operated. Operation of any of the relays FR1. FR2 FR3 ... acts through an associated auxiliary relay R1, R2. R3 ... to clutch a shaft 45 to a constantly driven motor 47, the direction of rotation being dependent on whether the reversing control relay FR4 (and hence R4) is actuated to energize the forward or reverse clutch coils 36a. 36b. The shaft 45 drives a contact arm 49 over a contact disc similar to the transmitter selector disc 10 in correspondence with the movement of contact arm 9 at the transmitter, the shaft 45 rotating in the followup sense and being stopped when correspondence is achieved by short-circuiting of the operative relay R1, R2. R3 ... over contact arm 9 and appropriate contact segment 51. 52. 53 . . . Modifications. Fig. 8 discloses two rotary feld type receivers 78, 79. each set in response to the operation of three frequency sensitive relays FR1-FR3, FR4-FR6 through relays R1-R3 .  R4-R.6 which energize the associated field coil pairs snccessively to position the magnet armatures. Lateral movements of the control column. rudder control and all other controls on a craft may also be transmitted as 'above described. The movement of aircraft -instruments may also be transmitted. Thus three accelerometers, maintained always in the same attitude in known manner by means of a gyro-compass, and responsive, respectively, to acceleration in three mutually perpendicular planes may actuate spindles the movements of which are transmitted as above described. A double integration of the acceleration may be effected at transmitter or receiver to indicate displacement. The horizontal displacement of a pluraiity of aircraft may be indicated by applying their co-ordinate displacements derived from such accelerometers to corresponding screw pairs e.g. 98, 100, Fig. 10, to move lamps 102 which project images of the associated aircraft on to a translucent map 96. Altitude of each aircraft may be signalled by transmitting further selective frequencies to actuate a vibrating reed type frequency meter 105 under the control of buttons 106, 107 ... corresponding to the respective recorded as well as the movements of the aircraft. The course of a craft may be various aircraft controls and meter readings on a craft by means of light, magnetic or sound recording apparatus.