 | Edward Daniel Clarke - 1824 - 630 Seiten
...most favourable for this process is in a forest near to a marsh or bog; because the roots of the^r, from which tar is principally extracted, are always the most productive in such places. A conical cavity is then made in the ground (generally in the side of a bank or sloping hill); and the... | |
 | 1829 - 446 Seiten
...most favourable for this process is in a forest near to a marsh or bog; because the roots of the fir, from which tar is principally extracted, are always the most productive in such places. A conical cavity is then made in the ground (generally in the side of a bank or sloping hill) ; and the... | |
 | 1830 - 438 Seiten
...most favourable for this process is in a forest near to a marsh or bog ; because the roots of the fir, from which tar is principally extracted, are always the most productive in such places. A conical cavity is then made in the ground (generally in the side of a bank or sloping hill) ; and the... | |
 | Charles Williams - 1833 - 284 Seiten
...most favorable for this process is in a forest near to a marsh or bog ; because the roots of the fir, from which tar is principally extracted, are always the most productive in such places. A conical cavity is then made in the ground (generally in the side of a bank, or sloping hill), and the... | |
 | William Rhind - 1841 - 756 Seiten
...most favourable for this process is in a forest near to a marsh or bog; because the roots of the fir, from which tar is principally extracted, are always the most productive in such places. A conical cavity is then made in the ground (generally in the side of a bank or sloping hill); and the... | |
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... from which tar is principally extracted, are always the most productive in such places. A conical cavity is then made in the ground (generally in the side of a bank or sloping hill) ; and the roots of the fir, together with logs or billets of the... 