A vehicle location system for vehicles travelling over a predetermined route in which equipment in the vehicle derives information concerning the distance travelled from predetermined junctions and the turns made and computing means within the vehicle computes the route between road junctions on which the vehicle is travelling. Each vehicle carries transmitter means for transmitting computed location information to a base station when interrogated by the same.

Saw guide apparatus for longitudinal or near longitudinal saw cuts in an elongate workpiece has a base from which at least one saw guide column projects upwards. The base and said column provide respective horizontal and vertical bounding faces which are coplanar so as to define a vertical support plane against which the elongate workpiece can be placed to depend below the base. Location means are provided to set the position of the workpiece transversely to a saw guide plane defined by said gui…

A location marking device having a plurality of circumferentially spaced, brightly colored curved plastic tube members. These members can be secured to lines near air fields to mark their location. The tubes are arranged to present an optical illusion of rotation when viewed by a person in a moving vehicle.

A device or arrangement forms an integral part of, or a separate attachment for, saw guide apparatus and functions as a workpiece location guide for making saw cuts in the end face of an elongate workpiece parallel or slightly inclined to the workpiece longitudinal axis. The guide is provided with means for varying the inclination of the workpiece to a saw guide plane about mutually perpendicular axes parallel to a saw guide plane of said apparatus, and for regulating the spacing of successive s…

Locating a tacky polymer-coated steel sheet on a magnetic rubber-covered glass support by sliding the support out from under a shield and carrying the steel sheet with the magnetic support gradually to place the sheet on the support.

Location apparatus for making saw cuts in workpieces has a saw guide and support means for a workpiece to set a side face of the workpiece at predetermined positions to the saw guide. In various forms of the apparatus, said positions are angularly adjustable in horizontal and/or vertical planes. Means are also described for setting the workpiece to a predetermined location transversely of the sawing plane defined by said saw guide.

An improved data transmission system which transmits data at least partially over existing telephone lines, the improvement comprising devices which, in addition to transmitting and receiving data and being actuated by a non-telephone signal, automatically complete a telephone communication with a predetermined computer. Once the device is connected to the computer, it receives information such as a particular telephone number which is used in the reception and/or transmission of data. The recei…

A locating system 10 for locating predetermined labelled objects 20 includes a transceiver unit 12 which comprises a narrow beamwidth antenna 14 for transmitting an energizing signal 16 at a predetermined first frequency and for receiving a returned signal 22 at a predetermined second frequency from an object to be located, the energizing signal 16 incorporating a predetermined transponder category code. A plurality of label-like transponders 18 is provided, each of which is affixable to an obje…

A method of locating an intermittent electrical fault in an optical undersea transmission system, comprises measuring the time difference between two signals emanating from the fault along two different routes of the system. In one embodiment one of the signals is a voltage transient and the other signal is an optical error signal created in a repeater adjacent the fault as a result of surge protection in the repeater responding to the electrical fault, and in another embodiment both signals are…

A difference between a received wave and a convolution operation result is calculated by a difference calculating section, the convolution operation result being obtained by carrying out a convolution operation based upon operation results output from impulse response operating sections (1.sub.0)(1.sub.1) . . . (1.sub.n) which employ a peak value of each pulse as a multiplier and employ an estimated value of an unknown impulse response as a multiplicand, each pulse being obtained by obtaining a …