Abstract: A magnetic assembly for a nuclear magnetic resonance apparatus includes a number of primary permanent magnets 1 disposed in an array about a longitudinal axis, the arrangement and/or characteristics of the plurality of magnets being such so as to create a zone of homogeneous magnetic field at some location along the axis forward of the array (and into the material when provided). A secondary permanent magnet 7 may be located along the longitudinal axis within the array of primary magnets and may be moveable. The primary magnets 1 have a north pole and a south pole with an axis therebetween, and may be arranged such that the axis between the poles is at an angle to the longitudinal axis.

Abstract: A cord retainer (10, 100, 140, 160) for retaining cords such as electrical power leads (32) and pneumatic hoses in an elevated position above the ground or floor. The cord retainer (10, 100, 140, 160) has a flexible web (14, 146, 168) with holes (30, 148) dimensioned to receive a cord (32) and substantially retained it against longitudinal movement with respect to the web (14, 146, 168) to the extent that the cord (32) is substantially prevented from sliding longitudinally in the hole (30, 148) under the force of its own weight or during normal installation of the cord (32), in two spaced apart cord retainers (10, 100, 140, 160). A series of frames 170, 180 and 190 are also provided for attaching the cord retainer (10, 100, 140, 160) structures on building and construction sites.