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There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts. The most common is the mercury tilt switch. It is in one state (open or closed) when tilted one direction with respect to horizontal, and the other state when tilted the other direction.
An altazimuth mount or alt-azimuth mount is a simple two-axis mount for supporting and rotating an instrument about two perpendicular axes – one vertical and the other horizontal. Rotation about the vertical axis varies the azimuth (compass bearing) of the pointing direction of the instrument.
Mantel—Either the shelf above a fireplace or the structure to support masonry above a fireplace [23] Smoke shelf—A shelf below the smoke chamber and behind the damper. It collects debris and water falling down the flue. [24] Throat (waist)—The narrow area above a fireplace usually where the damper is located. [21]
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Left-to-right: Ball head, one-way tilt head and three-way tilt head. A tripod head is the part of a tripod system that attaches the supported device (such as a camera) to the tripod legs, and allows the orientation of the device to be manipulated or locked down. Modular or stand-alone tripod heads can be used on a wide range of tripods ...