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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 .
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).
Peter Frantz was the Company's inventor. An adjustable lighting product called the "Lightning Lamp Adjuster" was patented and was among its first production products. The Company soon expanded its line to hardware products ranging from hinges to barn door track and hangers to garage door hardware for the new automobiles that began to appear. It ...
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 ...
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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.