Abstract: Disclosed is an apparatus for providing a pair of images to a fixed security camera, the apparatus comprising an angled mirror assembly comprising a left mirror and a right mirror joined at an edge therebetween and disposed at an angle between approximately 60.degree. and 120.degree., preferably 90.degree., to each other. The mirrors are mounted on the angled mirror assembly such that images transmitted through each of a pair of windows of a housing are reflected by the mirrors towards a camera assembly, and the mirrors are bevelled at a joining edge such that no image is generated from the area within and between the respective surfaces thereof. As a result, a left image incident upon the left mirror is reflected thereby towards the camera, and a right image incident upon the right mirror is reflected thereby towards the camera, and the resultant image captured by said camera is composed of a split image of the left image and the right image.

Abstract: There is disclosed a method and apparatus for communicating in multi- and single story building structures and parts thereof wherein a signal voltage source is connected to a metallic building structural member which is an integral part of the building. Multi-story buildings at least as high as fifty stories have been excited by utilizing a structural member such as a vertically extending stand pipe and like structural members. In such multi-story structures and in smaller structures such as one story frame, masonry and metal building structures, one of the terminals from the voltage source may be connected to earth ground by stakes or rods driven in the ground. Resistance means are inserted in the lines to limit the short circuit current and to provide a degree of impedance match.