Very stable, polymer-based electrochemical devices, formed by polymerization of thiophene or a derivative such as 3-methylthiophene which is durable in an aqueous electrolyte over a wide pH range, which respond rapidly to chemical or electrical signals, are disclosed. In one embodiment, the device functions as an extremely sensitive sensor which measures changes in chemical concentration or pH. For example, a poly-3-methylthiophene-based device is sensitive to as little as 8.times.10.sup.-16 mol...

There is disclosed a device for latching a well tool within the seal bore of a pocket to one side of a bore through a mandrel connectable in the well string. The mandrel has a recess above the seal bore to receive latching dogs on the lower end of collet fingers carried by the device and an upwardly facing shoulder above the recess which engages the latching dogs to cause them to be flexed inwardly as they are lowered into positions opposite the recess.

A semiconductor integrated circuit for sensing a physico-chemical property of an ambient includes a pair of semiconductor devices (Q1, Q2) having a similar geometric and physical structure, one device (Q1) being sensitive to the property, the other being insensitive to the property, together with a differential amplifier (A1, A2, A3, A4, A5) having feedback connection to one of the pair of semiconductor devices.

A microstrip antenna or other microstrip device has a planar electrically-conductive region on the surface of a dielectric board. The device is tuned by silk-screen printing one or more layers of a dielectric ink/paint over the surface of the device. This produces layers of a predetermined thickness which each reduce the frequency of tuning of the device by a predetermined amount until the desired frequency is achieved.

A probe device comprises a two-channel capacitive measuring sensor together with two further single-channel capacitive measuring sensors so disposed that the tips of the sensors are disposed in a common horizontal plane, the sensors being operable to detect the position and speed of movement of an interface between first and second phases in a system made up of at least two phases, such as a gas-solids fluidized bed. The data obtained when the probe is contacted by a gas bubble in the fluidized ...

An information device comprises a relatively rigid support portion suitable for attachment to a person, animal or object, and a relatively flexible information label secured to the relatively rigid support portion. The secured label is extendable in use into an open state and also storable into a closed state either adjacent to or around the support portion. A cover member is provided to contain said secured label when stored relative the support portion.

A measuring apparatus for measuring quantity of grain passing through a conduit which includes a closely fitting auger within the conduit and a separate auger coaxial with the measuring auger arranged to push the particulate materials into the inlet end of the measuring auger to ensure that this is kept full during the measuring rotation and achieving this with the measuring auger fully within the inlet end of the measuring conduit which will substantially avoid cracking of the grain or other pa...

An arming device for a missile having a rotating tail fin assembly is disclosed. The device includes a distance counter comprising a given length of coiled tape contained within a rotatable drum, the length of the tape being determined by the distance required to be covered by the missile before arming the warhead. The tape is wound onto a shaft driven by the tail fin assembly from the drum which is initially locked to the missile body, and when the tape has been completely wound onto the shaft,...

An aerodynamic device includes a rotor connected, for rotation about an axis, by bearings to a bridle to which a securing line is attached. At least one stabilizer fin is hinged to the rotor on an axis at right angles to the rotation axis. Each stabilizer fin is free to move angularly about its hinge axis in flight.

A signal lamp having a housing in which a source of light is mounted, with the support surface being mounted in front of the light source. The support surface comprises the face plate of the signal lamp and has mounted thereon a pattern, symbol, or indicia which is displayed for the attention of an observer when the light source is inoperative. The pattern, symbol or indicia is of such a thickness that it reflects ambient light so as to be readable when the light source is inoperative, but thin ...