Abstract: A slope stabilizer in which both a ground anchorage and a soil nail are located in a single borehole. The ground anchorage includes a plurality of ground anchorages, each including a tensile member bonded to the bore grout along substantially its whole length. The slope stabilizer has the advantage of allowing the ground to be pre-stressed using the ground anchorages. However, an active zone of the ground is also stabilized by the soil nail, which allows a lighter facing structure to be used than is normal with ground anchorages. Economy of operations is obtained, as a number of items are included in a single borehole.

Abstract: An image detection system comprises a camera (2) for generating an electrical output signal representative of the detected image. The camera is carried by a headset (1, 3) for attachment to the head of a user, and comprises a transducer (6; 106) for generating an electrical output in response to light incident thereon. Magnifying means (22) are situated in the path of light to the transducer, and is arranged to magnify the detected image. The transducer and magnifying means are positioned in such a way that, in use, the portion of the path of light passing through the magnifying means extends laterally across the front of the user's head, enabling the system to be of a relatively compact construction.

Abstract: A ground anchor assembly comprises a looped cable 3 passing around a saddle 4 with one or more optional recesses 8 in its outer surface 7, all this being held in place by solidified grout or the like in an elongate bore 1. Extension 5 gives good transfer of forces when both cable ends are stressed outwards, and tubes 6 prevent internal cracking of the grout. After a period of use the cable 3 can be removed by pulling one cable end only.More than one such cable 3 can pass round saddle 4, and more than one such assembly can locate in the bore 1.