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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 company continued to expand its product line in the 1920s and 1930s, adding a wide array of products, including barn cupolas, exhaust and intake hoods and louvers, fans, valves, pulleys, power hoists, concrete mangers, a patented garage door hanger (using overhead door tracks for ease in opening and closing), playground equipment (including ...
Some sliding doors run on a wall-mounted rail, like this one Sliding doors in a modern wardrobe. 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.
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 ...
Patented track rails are engineered specifically for overhead cranes and monorails. [9] [10] Unlike a symmetrical structural rail, the material in a patented track rail is placed where it is most effective allowing for a significant reduction in weight. The rails are engineered to be twice as strong as typical A-36 structural beams and have a ...
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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