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| Roadbed
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The base over which a road's paving is installed. The roadbed is usually topped with graded crushed stone. |
| Robertson screwdriver
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The robertson screwdriver is commonly used in mobile homes, boat construction, travel trailers and the hobby industry. |
| Rock bin
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A container that holds rock used as the thermal mass to store solar energy in a solar heating system. |
| Rock drainfield
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A field containing 3/4 inch crushed stone used to drain leach lines from a septic system. |
| Rock garden
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An area constructed of larger rocks arranged to look natural. Planted with plants that generally do not need a lot of care. |
| Rock wool
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A type of insulation made from virgin basalt, an igneous rock, and spun into loose fill or a batt. It is fire resistant and helps with soundproofing. |
| Rocker switch
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Electrical switch, which is operated by touching the top or bottom of the control plate. |
| Rockwell hardness test
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A test used to measure the hardness of a substance. A steel ball or cone is impacted on the material and the impression is measured. |
| Rockwool
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This really is the state of the art rooting medium, and is used in plant propagation. It is alkaline and one will have to compensate for this. |
| Rod
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Linear unit of measurement equal to 16.5 feet. |
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