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The diagram on the left illustrates a bar and a ring in the rest frame of the ring at the instant that their centers coincide. The bar is Lorentz-contracted and moving upward and to the right while the ring is stationary and uncontracted. The diagram on the right illustrates the situation at the same instant, but in the rest frame of the bar.
There are a total of 16 bobsleigh, luge, and skeleton tracks around the world in use for competitions. All of the current tracks on this list are constructed of reinforced concrete and use artificial refrigeration to keep the track cool enough during early and late season to hold ice.
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.
Pole buildings do not require walls but may be open shelters, such as for farm animals or equipment or for use as picnic shelters. Enclosed pole buildings have exterior curtain walls formed by girts fastened to the exterior of the posts at intervals about 2 feet (0.61 m) on center that carry the siding and any interior load.
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 .
A firepole in Cologne with a door at the entry. Losing one's grip on the pole can result in falling from a great height; the firefighter may hit an object such as a door extending from a truck; poor speed control can result in injured or even broken legs upon impact with the floor; and burns can occur due to friction if the skin rubs against ...
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