Abstract: A method for use in connection with installing a cable into a conduit having a first conduit end and a second conduit end, comprising the steps of—providing the cable with a metallic attribute,—providing within or proximate to the conduit, sensing means for sensing the metallic attribute,—introducing the cable into the first conduit end and driving it towards the second conduit end and—detecting that the sensing means has sensed the metallic attribute by sensing a change in inductance levels of the sensing means.

Abstract: A system for producing a three-dimensional image of a surface, such as a surface of a cornea, includes a laser beam that passes through a beamsplitter and an objective lens to produce a spherical wavefront that impinges on the cornea and is reflected by the cornea as a return beam back through the objective lens. The return beam is reflected by the beamsplitter through an imaging lens that focuses the return beam onto an imaging screen, through a dual phase plate, and onto a photosensitive array. The dual phase plate includes two sets of spaced periodic refractive features spaced along orthogonal directions. The phase plate is modulated by incrementing it at a 45 degree angle relative to the first and second directions, thereby simultaneously producing phase shear along the two orthogonal directions.

Abstract: To retain a lamp in a reflector body of a light assembly, a wire retaining clip is provided which has a U-shaped anchor portion disposed as a friction fit in a recess in the body. Arms of the clip extend in cantilever fashion from the anchor portion and engage against a flange on the lamp so as to urge an abutment surface on the lamp into engagement with a corresponding abutment surface in the reflector body. The arms of the clip are resiliently biassed in the same direction as that required to bring said abutment surfaces into mutual engagement and are also resiliently deformable outwardly so as to facilitate snap-engagement of the lamp into a lamp-receiving aperture in the reflector body.

Abstract: A pipe coupling includes a nut in which a collet, a back-up member and an anti-extrusion washer are retained by means of an axially split ring which is detachably engageable in a peripheral groove in the back-up member and engaged in a recess in the nut. The anti-extrusion washer has an extrusion press fitted into the member. This construction permits the various parts to be easily assembled into the nut without the risk of damaging the ring or the screw-threading in the nut.