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A roller shutter, security shutter, coiling door, roller door or sectional overhead door is a specialized type of door or window shutter consisting of multiple horizontal slats, bars, or web systems interconnected through hinges. The mechanism involves lifting the door to open it and lowering it to close.
A groove is cut into the bottom of the door which runs over this guide, preventing lateral movement of the door. With a glass door, the panel runs through the guide as illustrated. Because the door is always engaged in the guide, when the door is open, the floor is clear; hence 'clear threshold'. The bottom of the doors are held in place on tracks.
Connex South Eastern Class 423 at Waterloo East in February 2003 c2c Class 312 at Shoeburyness in March 2003. A slam-door train or slammer is a set of diesel multiple units (DMUs) or electric multiple units (EMUs) that were designed before the introduction of automatic doors on railway carriages in the United Kingdom and other countries, which feature manually operated doors.
A Trombe wall is a massive equator-facing wall that is painted a dark color in order to absorb thermal energy from incident sunlight and covered with a glass on the outside with an insulating air-gap between the wall and the glaze.
Below is a list of various museums and historical institutions as well as venues open to the public that have in the past or are currently exhibiting Soap Box Derby racers or adding them to their permanent collections, usually acquired via donation by the cars' original owners.