For injecting substances into a liquid e.g. molten metal, a nozzle block (21) is mounted in the wall of a vessel (13) containing the liquid. Initially, an injection passage (11) extending through the block is closed by a plug (22) to prevent ingress of liquid, and only when injection is to commence, is the plug (22) thrust aside by a delivery pipe (24) movable in the passage (11), the pipe (24) fo...

PCT No. PCT/GB87/00443 Sec. 371 Date Apr. 25, 1988 Sec. 102(e) Date Apr. 25, 1988 PCT Filed Jun. 24, 1987 PCT Pub. No. WO88/00322 PCT Pub. Date Jan. 14, 1988.A method is provided for restoring a refractory lining for repeated use. The lining is present on a underlying wall surface and is still hot from a previous use when one induces thermal shock in the lining (e.g. by spraying water on it) so as...

A device for measuring the parameters of an underground mineral deposit which is capable of generating a nuclear magnetic resonance comprises a wire loop (1) placed on the ground surface and connected alternatively, through a controlled switch (2), to a generator (3) of alternating current excitation pulses and, through an information signal amplifier (5), coherent detector (7) and an analog-to-di...

PCT No. PCT/GB87/00433 Sec. 371 Date Feb. 9, 1988 Sec. 102(e) Date Feb. 9, 1988 PCT Filed Jun. 22, 1987 PCT Pub. No. WO87/07943 PCT Pub. Date Dec. 30, 1987.An apparatus for determining values of a periodic function by interpolation which comprises a reading device for receiving scanning signals A,B,C,D nominally in phase quadrature with each other from the periodic function. The signals are combin...

The invention provides an opto-electronic scale reading apparatus comprising a read head in which a plurality of optical emitter and receiver pairs are arranged so that beams of collimated light generated by the respective emitters fall on a common region of a scale. Compared to arrangements where the light beams fall on separate regions of the scale, the apparatus according to the invention is re...

PCT No. PCT/GB87/00435 Sec. 371 Date Feb. 18, 1988 Sec. 102(e) Date Feb. 18, 1988 PCT Filed Jun. 22, 1987 PCT Pub. No. WO87/07945 PCT Pub. Date Dec. 30, 1987.The invention provides an opto-electronic scale reading apparatus wherein a read head comprises a lens adapted to project a beam of collimated light through a spatial filter on to a scale having lines. Light reflected from the scale passes ba...

The present invention is a sample splitter used to divide a larger sample of particulate material into representative smaller portions. The device uses a fixed conical sample splitter oriented with it apex upwards. Resting on this and translatable upwards is a sample receiving hopper. The hopper has open top and bottom ends. When receiving a sample to be divided, the bottom of the hopper rests on ...

Method for analyzing peptide sequences carrying an epitope characteristic of an antigenic protein to the organism of a host. Said method comprises the detection of those tetrapeptidic sequences contained in the antigenic protein which have no counterpart in a data bank gathering information relative to the amino acid sequences of the proteins of the ''somatic self'' of the host. The synthesis of t...

A simple, quick and inexpensive method for producing a highly purified ligand for use in immunoassays comprises, according to the invention, the use of antigens and their corresponding antibodies and a covalent or non-covalent binding to a solid support, under which antigens and antibodies are present in dissociated form. These antigens and antibodies are separated from irrelevant molecules, which...

An accelerometer comprising a body (10, 16, 12), proof mass (18, 30, 32), mounting means comprising flexures (20, 22) for mounting the proof mass to the body, and force sensing means (34, 38). The flexures permit translational motion of the proof mass with respect to the body along a sensitive axis SA and rotation of the proof mass with respect to the body about a hinge axis HA that is perpendicul...

Prior vibrating beam accelerometers are subject to errors caused by differential thermal expansion between the vibrating beams and other accelerometer components. This problem is overcome by the present accelerometer that comprises a housing (32), a proof mass (30), a support (34,36) for mounting the proof mass with respect to the housing, and first and second force sensing elements (38,40). The f...

The mounting system of the present invention is adapted to support a precision transducer (14) in spaced alignment with a supporting case (12). The mounting system comprises a plurality of mounting elements (30), each mounting element having one end (34), an opposite end (32) and a resilient intermediate portion (36). One end is adapted to be connected to the transducer, and the opposite end is ad...

An accelerometer with a pivoting beam to accommodate differential thermal effects. The accelerometer measures acceleration along a sensitive axis, and comprises a housing, a proof mass, support means and a coupling assembly. The support means mounts the proof mass with respect to the housing. The coupling assembly is connected to the proof mass and housing, and comprises a beam and first and secon...

A writing tablet is formed from a substantially continuous, fanfolded web of uniform width having transverse paths of weakness, along which the web can be torn evenly into individual sheets of uniform size. One face of the web bears a series of pressure-sensitive adhesive patterns, one pattern on each sheet, which pattern contacts the adhesive-bearing face of an adjacent sheet only in nonadhesive ...

An improved photographic cassette in which the plate and screen adjacent the front cover on the tube side of the cassette is unsecured to the front cover; that is, free floating, thereby achieving more uniform sheet-to-plate contact throughout the entire area of the sheet. The cassette also has a pressure plate and means forming a part of the pressure relieving means for engaging and holding the f...

A system for scanning a bar code label includes a light source for projecting light beams at the label, a rotating disc member located in a path of the reflected light beams, an array of charge-coupled devices mounted on the disc member for storing electrical signals upon sensing the reflected light beams, circuit means mounted on the disc member for reading and processing the electrical signals, ...

A document reader module which provides precise alignment for the document being read and the associated reader, like an optical reader. An integrated frame member provides accurate control surfaces for the precise alignment mentioned. An elevator mechanism mounted on the frame member provides an apparatus for adjusting the read head relative to the line of data on the documents being read. A spec...

A newspaper vending machine (10, 100) to vend a first newspaper (40) from a stack of newspapers (31), the newspaper vending machine (10, 100) comprising a guide means (24) for receiving the stack of newspapers (31), a propagation means (32, 26) for urging the stack of newspapers (31) along the guide means (24), a first stop (34) located at a first end (38) of the guide means (24), the first stop (...

Reversible electric battery comprised of a plurality of cells (1) which are connected in series by bipolar collectors, each cell comprising a positive electrode and a negative electrode formed by deposited zinc, and between which circulates an electrolyte containing zinc in the form of a solution. The reversible electric battery is characterized in that each of the cells is vertical and comprises ...