Abstract: A hood assembly for opacity monitoring equipment including an opacity monitor fixedly secured to an outside surface of a smokestack or chimney includes a hood for protectably covering the opacity monitor and associated guide. The guide is connectable to the monitor in a stationary relationship therewith and cooperates with the hood for guiding bodily displacement of the hood relative to the monitor along a substantially vertical path between a lowered condition at which the monitor is substantially covered by the hood and an elevated condition at which the monitor is accessible.

Abstract: A light assembly for illuminating an industrial smokestack or the like having a ladder attached thereto utilizes an obstruction light and an elongated member having one end which is pivotally connected to the outside surface of the smokestack and another end which supports the obstruction light. The elongated member is pivotally movable between a first condition at which the other end of the elongated member is positioned remote of the ladder and a second condition at which the other elongated member end is positioned adjacent the ladder. The assembly further includes a rod member having one end which is pivotally connected to the elongated member and another end which is positionable adjacent the ladder so as to be accessible to a serviceman standing upon the platform. By selectively pulling or pushing upon the rod member, the serviceman moves the elongated member between the first condition and the second condition at which the light is accessible for servicing purposes.