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| sheet winch | |||
| lifting jack | |||
| Spanish windlass; wheel and axle; whim | |||
| cathead | |||
| turning machine | |||
| hoisting engine | |||
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| lathes; winches (para elevar pesos) | |||
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| lathes machine tools | |||
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| peeler | |||
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| lathe | |||
| winch | |||
| vertical boring mill | |||
| hoist | |||
| machine with revolving pads | |||
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| cyclone | |||
| tornado | |||
| tornado A rapidly rotating column of air developed around a very intense low-pressure centre. It is associated with a dark funnel-shaped cloud and with extremely violent winds (>300km/h) blowing in a counterclockwise spiral, but accompanied by violent downdraughts. The precise mechanisms are not fully understood but the following atmospheric conditions appear to be necessary for tornado development: a layer of warm moist air at low altitude; a layer of dry air at higher altitude with an inversion of temperature at about 1.000 m; a triggering mechanism, usually in the form of an active, intense cold front or solar heating of the ground which will create a vortex; twister | |||
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torno : 259 צירופים, 24 נושאים |