 This operation is performed for the space of a quarter of an hour, the water then begins to run clearer. Having washed the earthy particles away, the gravel-like matter is raked up to the end of the trough ; after the current flows...  Travels in South America - 327 페이지저자: William Bingley - 1820 - 346 페이지전체보기 - 도서 정보
 | 1812 - 1020 페이지
...pounds •weight of cascalhao. The water being then let in upon it, the cascalhao is spread abroad and continually raked up to the head of the trough,...constant motion. — This operation is performed for the space of a quarter of an hour j the water then begins to run clearer, having washed the earthy... | |
 | John Mawe - 1812 - 422 페이지
...eighty pounds weight of cascalhao. The water being then let in upon it, the cascalhao is spread abroad and continually raked up to the head of the trough,...in constant motion. This operation is performed for the space of a quarter of an hour; the water then begins to run clearer, having washed the earthy particles... | |
 | 1812 - 532 페이지
...cascalhuo. The water heing then let in upon it, the cascalnfio is spread abroad and continually raked tip to the head of the trough, so as to be kept in constant motion. This operation is performed for the space of a quarter of an hour ; the water then begins to run clearer; having washed the earthy... | |
 | Anonymous - 1812 - 512 페이지
...head of the trough so us to be kept in constant motion. This operation is performed for the space of a quarter of an hour; the water then begins to run clearer. Having washed the earthy particles •way, the gravel-like matter is raked up to the end of the trough... | |
 | 1813 - 818 페이지
...eighty pounds weight of casralhao. The water being then let in upon it, the cascalhao is spread abroad and continually raked up to the head of the trough,...in constant motion. This operation is performed for the space of a quarter of an hour; the water then begins to run clearer, having washed the earthy particles... | |
 | 1813 - 702 페이지
...head of the trough, fo as to be kept in confiant motion. This operation is performed for the fpace of a quarter of an hour; the water then begins to run clearer, having wafned the earthy particles away, the gravel-like matter is raked np to the end of the trough... | |
 | 1813 - 706 페이지
...head of the trough, fo as to be kept in conitant motion. This operation is performed for the fpace of a quarter of an hour; the water then begins to run clearer, having wafhed the earthy particles away, the- gravel-like matter is raked up to the end of the trough... | |
 | Rev. Edward Polehampton, John Mason Good - 1818 - 566 페이지
...water being then let in upon it, the cascalhao is spread abroad and continually raked up to the iiead of the trough, so as to be kept in constant motion. This operation is performed for the space of a quarter of an hour ; the water then begins to run clearer ; having washed the earthy... | |
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