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| Catch
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Automatically securing latch on a gate or door. |
| Catch basin
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Basin which collects water that has been rerouted from another location. |
| Catenary
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When a line is freely suspended from two fixed points, the curve that occurs in the cable is a catenary. |
| Cathedral ceiling
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High, vaulted, open ceiling. |
| Cathode
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The negative pole or electrode of an electrolytic cell, vacuum tube, etc., where electrons enter (current leaves) the system; the opposite of an anode. |
| Cathode disconnect ballast
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An electromagnetic ballast that disconnects a lamp's electrode heating circuit once is has started; often called "low frequency electronic" ballasts. |
| Cathode ray tube (crt)
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Monitor screen of a computer. |
| Cathodic
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Metals low in the Galvanic Series. |
| Cathodic protection
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A method of preventing oxidation of the exposed metal in structures by imposing between the structure and the ground a small electrical voltage. |
| Cation
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A positively charged ion in an electrolyte solution, attracted to the cathode by a difference in electrical potential. |
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