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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 .
The 'top-hung' system is most often used. The door is hung by two trolley hangers at the top of the door running in a concealed track; all the weight is taken by the hangers, making the door easier to move. [4] At each end is a track stopper to absorb any impact made if the door is slammed and to hold the door in the open or closed position.
In Medieval times, the canals were used for drinking water, water wheel operation, and sewage disposal. In 1875, in order to collect drinking water from the upstream end of the system, a water collection and filtration plant was built straddling a new bypass branch of Capital Creek, near the dam. (In 2007 it was decommissioned and converted ...
It provides shelter over a window or door used for passing hay into the attic or loft of the barn; it may hold a pulley for hoisting hay or hay bales up to the loft, or a fork or grapple and track system (or hay carrier) where hay can be lifted and then moved throughout the barn. A barn may have the ridge beam extended past the wall with a ...
Doors in a bypass unit overlap slightly when viewed from the front so they do not have a visible gap when closed. Doors which slide inside a wall cavity are called pocket doors. This type of door is used in tight spaces where privacy is also required. The door slab is mounted to roller and a track at the top of the door and slides inside a wall.
A large door at the top of the ends of the barn could be opened up so that hay could be put in the loft. The hay was hoisted into the barn by a system containing pulleys and a trolley that ran along a track attached to the top ridge of the barn. Trap doors in the floor allowed animal feed to be dropped into the mangers for the animals.
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