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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 .
To prevent small gaps around the closed doors at the beam penetration that would allow birds to enter the barn, one farmer in Reasnor, Iowa, designed a hay hood with a "bunker door" that when closed, was an angled floor on the hay hood, completely enclosing the hood and keeping birds such as sparrows and pigeons out of the barn. [5]
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The hay track developed in the early 19th century, here showing how the hay hood (roof extension) covers the track. The gable wall of this barn is missing. In older style North American barns, the upper area was used to store hay and sometimes grain. This is called the mow (rhymes with cow) or the hayloft. A large door at the top of the ends of ...
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