Abstract:
The invention is concerned with an anti-roll stabilization system for ships of the kind in which a fin, in operation, protrudes from the ship below the water-line and is angularly displaced about its axis by power means in response to a fin control signal, wherein a primary signal produced by a sensing device responsive to rolling motion of the ship is processed by a configuration of operational amplifiers programmed to produce a fin control signal having the required phase advance, gain/frequency characteristic to position the fin to reduce the rolling moment of the ship.
Abstract:
Apparatus for guiding an edge portion of an article through a stitching machine has supports for supporting the article and sensor means such as a fluid jet and sensor interrupted by the edge of the cloth. The sensor means provides a sewing guidance signal indicative of the position of the edge of the article to be stitched and means responsive to the sewing guidance signal move one or more of the supports to guide the said edge towards the said predetermined position. Preferably the supports support a tubular article in tubular form. In cases where the edge of a tubular article after the stitching operation is displaced relative to the position the edge had before the stitching operation, there may be included seam detector means arranged to detect the beginning of the stitched edge of the tubular article and to discontinue guidance of the edge.
Abstract:
WHERE X1 is halogen, alkyl, alkenyl or aryl, X2, X3 and X4 are hydrogen, halogen or alkyl, R1 and R2 and hydrogen or alkyl and R3 is a group having carbon-carbon unsaturation Alpha to the CH2 group to which R3 is bonded, e.g., R3 phenyl, are prepared by esterification.
Synthetic pyrethroid insecticides, having no methyl substituent in the 3 position on the cyclopentenone ring, and of formula
Abstract:
A process for producing a composite material article comprising inserting an inner member together with a mixture of fibrous reinforcement impregnated with partially cured resin, the mixture at least partially enveloping the inner member, into a hollow sheath wherein the mixture fills the space between the inner member and the hollow sheath.
Abstract:
A magnetic lens, for focusing a beam of charged particles, includes a coil at least part of which, at an end thereof, tapers conically with a half-angle between 20* and 85*. The coil may comprise a plurality of conductors laid concurrently, and cooling means may be provided in contact with the inner surface. Desirably, the coil is shrouded, at least in part, with material of high magnetic permeability. Radiation such as X-rays, from a target in focus beyond the tapering end of the coil, may be detected over a large solid angle.
Abstract:
A method of changing the speed of a three-phase induction motor by deriving from the A.C. supply a modulating wave of submultiple frequency, deriving therefrom a corresponding rectangular wave, modulating each phase of the supply by three such modulating waves, with the same sequence or opposite sequence to the supply phases. Modulation of the supply is effected by gating thyristors from the modulating waves. By varying the modulation frequency, the motor speed is varied stepwise over a speed range.
Abstract:
A DEVICE FOR THE MANUAL APPLICATION OF A LIQUID OVER A SURFACE COMPRISING A GLOVE HAVING ABSORBENT MATERIAL ON THE OUTSIDE AND FRONT THEREOF AND ADAPTED FOR CONNECTION TO PASSAGE MEANS FOR SUPPLYING A CONTROLLED FLOW OF LIQUID FROM A RESERVOIR TO THE ABSORBENT MATERIAL BENEATH THE
OUTER SURFACE THEREOF, THE ABSORBENT MATERIAL BEING SUCH THAT THE LIQUID IS EXPRESIBLE THROUGH THE MATERIAL ON TO ITS OUTER SURFACE BY MANUAL PRESSURE.
Abstract:
A control-surface device for use as a rudder or stabilizer fin. The devices described are of hydrofoil shape with jet discharge slots to either side of the device adjacent its distal portion. When used as a jet flap rudder, a jet of fluid is discharged from the advanced face of the rudder to assist steering. When used to provide a pair of stabilizer fins, jets of fluid are discharged from the leading faces of the fins as these are moved through the supporting fluid by a rolling motion of the ship.
Abstract:
To cut paper, timber, fabric etc., with a laser beam, a jet of air (or other gas which is inert in the process) carrying an atomized stream of a liquid coolant is directed on to the moving region of the workpiece at which the laser beam is concentrated. This reduces the spread of charring or tar deposit from the cut along the surfaces of the workpiece.
Abstract:
Use of an object-engaging device in the form of a deformable non-stretch container enclosing a sealed volume of fluent granular material is proposed for at least one of a plurality of force applying members in a gripping apparatus. The container is preferably of a double-walled construction with two flexible walls of which one is elastic, and the inner part is preferably sub-divided. Incorporation of a pressure transducer to indicate applied force conveniently involves the use of electrically conductive granular material to act as a variable resistor.