| 摘要 |
A device for killing moss on rooftops comprises an elongated bimetallic trough for horizontal positioning along a rooftop to catch rainwater. In one embodiment the walls of the trough include a layer of copper and a layer of lead sandwiched together. Small holes through such layers, and spaced apart in rows along a wall of the trough, slowly drain the rainwater onto the rooftop. As the water passes through the holes, contacting the junction of the lead and copper layers, an electrolytic action occurs in which ions of the metal dissolve into the water. The resultant electrolyte kills the moss. Another embodiment comprises a plastic trough having holes in one side and containing pieces of lead and copper.
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