Abstract: An environmental protective garment, especially for use in "clean rooms", is an at least partly air resistant garment having suitable body seals and an air mover means for providing a negative pressure within the garment when worn. The exhausted air from the air mover means may be passed through a scrubber or filter. Greater wearer comfort is possible than with known suits.

Abstract: A filter press cloth hanger for a filter press comprising two arms joined at their upper ends by a pivot bolt which extends through platelike members welded to the tops of the arms. Each arm is similar in construction and comprises the hollow tubular outer wall in which slides a spring loaded rod. The rod carries at its lower end outside the arm a latching plate, which has a keyhold aperture, designed to fit over the end of a suspension member for a filter plate. The rod carriers at its free end within the hollow tubular outer wall, a stop member, which is screwed to the end of the rod and prevents the rod from being completely withdrawn from the tube. The stop is also profiled to prevent rotation of the rod within the arm and bears on one end of a compression spring which biases the rod in the arm. The pivot bolt carries a roller, which can run along a support bar, extending the length of the side bar filter press on which the hanger is to be used.

Abstract: Relative angular movement between two linear members is detected by shining light from a light source (11) through a triangular mask (12) in one member onto a mirror (10) in the other member and reflecting the image of the triangular mask onto a linear array of detectors (15). Movement between the two members causes different detectors in the array to be illuminated and the position and number of detectors illuminated determines the X and Y axis of movement to enable the relative angular movement of the two members to be calculated.

Abstract: A powered respirator helmet comprises a shell, having a passage, between a filter medium, and a fan, mounted in the front peaked part of the helmet shell. An air intake permits air to be drawn by the fan through the filter medium, through the passage and to be exhausted by the fan into the space between a wearer's face and a visor. The helmet is more compact, lighter and less expensive to service than existing respirator helmets, while providing more effective respiratory protection.

Abstract: A telemetry system for borehole drilling comprises an effectively continuous length of hardwire cable which extends along a drill string located in a borehole between electrical signal control, indication equipment situated outside the borehole and probe means situated within the borehole. The effective continuous length of hardwire includes a store of hardwire constituted by a bonded wound hollow coil of hardwire located adjacent the probe means.

Abstract: A moisture meter and method for determining moisture content in a mass of material is provided. A source of microwave radiation selectively produces radiation having a plurality of different frequencies and directs the radiation into the mass of material. A support is provided for the material, which is substantially transparent to the radiation. A detector determines the emergent intensity of the radiation of each frequency traversing the mass of material and the support. A signal processing unit, responsive to (1) an intensity level of incident radiation directed into the mass of material, (2) a level of the emergent intensity of the radiation after passage through the mass of material and the support, and (3) the selective radiation frequencies, determines a value characteristic of moisture content based upon a slope of a plot of attenuation representing a difference between the intensity level of the incident radiation and the emergent radiation versus each of the plurality of different frequencies.

Abstract: A cold coal briquetting process comprises mixing fine coal with polyvinyl alcohol and a hardening agent selected from iron oxide, phosphate rock and bauxite or combination of two or more thereof. The process permits economies in process and capital costs compared to existing briqueting processes, while still producing satisfactory briquettes.

Abstract: Cyclone separator for treating granular solid material to derive separate fractions of different densities, comprise a treatment chamber divided into first and second treatment compartments. A relatively more dense fraction of material is fed via interconnected outlet from one treatment compartment to the other treatment compartment for retreatment.

Abstract: In an instrument used to measure x-rays of the kind in which a wire anode operates in a gaseous atmosphere in a sealed housing to detect x-rays, the instrument is rejuvenated by passing a heating current through the anode to raise its temperature for a period of between two and six hours to convert any impurities to a compound.

Abstract: A settable composition, especially useful in underground mining may be produced by mixing mining tailings with a fine pozzolanic ash, and producing a pumpable slurry, and mixing the pumpable slurry with another composition containing a cement component. Good compressive strength may be obtained while at the same time troublesome or costly disposal of the tailings is avoided.

Abstract: A method of and apparatus for controlling the resultant velocity of a member is provided, the resultant velocity being derived by driving the member in two component directions, simultaneously. First sensor means derive a signal indicative of the resultant velocity, the derived signal being compared with a preselected reference signal to derive an error signal constituting a resultant velocity demand signal which is integrated to obtain a resultant amount of movement demand signal. The resultant amount of movement demand signal is selected from `look-up` reference table memory means and corresponding desired values derived for the amounts of movement of the member in the two component directions. The desired values are compared with signals derived from the first and second sensor means sensing the movement of member and error signals are obtained for controlling the driving of the member in the two component directions.

Abstract: Fine coal is cold briquetted using a binder which is 5-15% molasses and up to 5% of an inorganic hardening agent. An optional hot curing step gives water resistance. The briquettes show good strength characteristics and low undergrate losses during combustion.

Abstract: Cyclone separator for treating granular solid material to derive separate fractions of different densities, comprise a treatment chamber divided into first and second treatment compartments. A relatively more dense fraction of material is fed via interconnected outlet from one treatment compartment to the other treatment compartment for retreatment.

Abstract: A personnel detection and protection system comprises sensor means for detecting the presence of personnel in a prohibited operational zone, and for deriving signal means indicative of such a detected presence, and control means responsive to the deriving of such signal means to control the operation or movement of equipment in the prohibited zone.

Abstract: Fluidized bed apparatus includes a body having located therein a distributor provided with discharge ports connected to classifiers. Plates are located over the ports and air lances are disposed intermediate the plates and the ports. The plates serve to protect inbed tubing from erosion by entrained particles and the lances control the flow of material into the classifiers.

Abstract: A collar splitter for a lock bolt fastening system comprising a body having a partly tapered passage, a draw rod component slidable within the passage, and a cutter blade arrangement pivotally mounted on the draw rod component. A toggle link arrangement ensures that when the collar splitter is activated to split the relatively soft locking collar the cutter blades do not contact the relatively hard lock bolt.

Abstract: A directional antenna for an electromagnetic sensing system comprises a generally cylindrical tube of electrically-conductive material a portion of the tube being cut away to define a transversally-facing window. The non-cut away portion of the tube provides a backing shield for a pair of antenna elements mounted on a generally `V`-shaped support. A cover of dielectric material is arranged over the antenna elements.

Abstract: A personal dust sampler, for example to be carried on the lapel of a wearer, has a body part with a gas entry protruding therefrom. The entry has an aspiration efficiency of approximately unity for the gas flow rate of a pump (not shown) which is attachable to an exit from the body. Mounted inside the body is a filter which is removable for examination after a sampling period.

Abstract: A roofing method comprises applying to a roof deck a self-adhesive sheet comprising an adhesive and waterproofing layer of bituminous compound so that the sheet adheres to the deck over an area of 10-50% of the total sheet area and water vapor passing through the deck may escape laterally; rendering the upper surface of the sheet adhesive, for example by torching; optionally applying insulation board and a further self-adhesive sheet, and applying a final waterproofing sheet. The use of hot bitumen is completely avoided, the formation of waterproof and insulated roofs is simplified and economies are offered.

Abstract: An aerated cementitious composition is produced by feeding a mixture comprising cement and foaming agent to a mixing chamber open to atmosphere together with a feed of liquid. The ingredients are mixed and the wetted mixture pumped to a desired site, the capacity of pumping being greater than the feed rate of the ingredients into the mixing chamber such that air is drawn into the mixing chamber.