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A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects. It is a simple alternative to attaching a camera to a motorized equatorial mount .
A rock-climbing technique where a leg is held in a position to maintain balance, rather than to support weight, often to prevent a barn-door. [2] There are three types of flagging: [12] [11] normal flag Flagging foot stays on the same side (e.g. flagging right foot to the right side of the body). [12] [11] reverse inside-flag
A portal frame steel building under construction. Portal frame is a construction technique where vertical supports are connected to horizontal beams or trusses via fixed joints with designed-in moment-resisting capacity. [1]
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The method for calculating the size of a flitch beam to be used in construction is straightforward, using the transformed-section method. The steel plate is treated as an equally stiff piece of wood, with its width modified by the ratio of their moduli of elasticity. This allows the deflection of the entire beam to be calculated as if it were ...
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