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| DRIVE SHAFT
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Bridge crane shaft, which connects the drive, motor to a wheel at each end of the bridge and used to transmit power. Alternately called a squarring shaft or a cross shaft. |
| DRIVEWAY
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Path for cars, leading from the street to a house or garage, etc. |
| DRIVING TIME RADIUS
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Time it takes to drive to an outlying area from a major urban area. |
| DRIVING WHEEL
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Wheel that transmits motion and force, by receiving power from the engine by means of the connecting rod. |
| DROITURAL
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Action based on the whole body of the law. A lawful right being exercised. |
| DROP
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(1) Horizontal section on a vertical scaffold. (2) HVAC system term for the distance air has fallen vertically below an outlet at the point of the air's terminal velocity. Alternately, where the air velocity coming from an outlet decreases to 50 feet per minute. |
| DROP CHAIN
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Small link, weighted chain used to feed an electrical wire into a vertical passage. |
| DROP CLOTH
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Large piece of cloth, plastic, etc. used for protection against dripping paint or other messy jobs. |
| DROP FORGE
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Machine which forges metal by heating it to a malleable temperature and using weight to hammer the metal to provide the needed shape and size. |
| DROP HAMMER
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Casting made of heavy steel, which is raised and then dropped, from a certain height to drive pilings into the ground. |
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