The Owner-built HomesteadScribner, 1977 - 394 หน้า |
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หน้า 101
... cover objectionable gravel or shattered rock . For an earth dam the site should contain a large percentage of clay and some silt or sand . Too much clay causes cracks when dry and slippage when wet . Too much sand causes seepage . An ...
... cover objectionable gravel or shattered rock . For an earth dam the site should contain a large percentage of clay and some silt or sand . Too much clay causes cracks when dry and slippage when wet . Too much sand causes seepage . An ...
หน้า 171
... cover of snow further reduced freeze depth to only 6 inches . Mulch cover tends to retard spring blossoming . This is de- sirable where late frosts threaten , as they do in eastern Oregon , where it may freeze at any time during the ...
... cover of snow further reduced freeze depth to only 6 inches . Mulch cover tends to retard spring blossoming . This is de- sirable where late frosts threaten , as they do in eastern Oregon , where it may freeze at any time during the ...
หน้า 205
... cover- ing of a double layer of transparent material may be sufficient for less severe climates . If carefully sealed , this layering creates a dead - air space , usually 1 centimeter thick . Poly- ethylene film may suffice when ...
... cover- ing of a double layer of transparent material may be sufficient for less severe climates . If carefully sealed , this layering creates a dead - air space , usually 1 centimeter thick . Poly- ethylene film may suffice when ...
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