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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 .
Barn doors, or occasionally a set of barn doors, are an attachment fitted to the front of a Fresnel lantern, a type of lantern used in films, television, and theatres. [1] The attachment has the appearance of a large set of barn doors, but in fact there are four leaves, two larger and widening on the outside, two smaller and getting narrower ...
William added to the company's product line with his inventions of a flexible barn door hanger (1895), barn litter carriers and tracks (1898), all-steel cow stalls (1907), individual automatic watering bowls for cows (1912), an Easy Feeding Hog Trough (1914), and an industrial line of Overhead Carrying Equipment (1917).
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