 | James Dwight Dana - 1850 - 800 pagine
...wells, which afford annually 41 2,000 hlids. A remarkable lake of bitumen occurs on Trinidad, which is one and a half miles in circumference. The bitumen...softness towards the centre, where it is boiling. The solidified bitumen appears as if it had cooled as the surface boiled up in large bubbles. The ascent... | |
 | James Dwight Dana - 1854 - 946 pagine
...wells, which afford annually 412,000 hhds. A remarkable lake of bitumen occurs on Trinidad, which is one and a half miles in circumference. The bitumen is solid and '•old near the shores, but gradually increases in temperature and softness towards tlie centre, where... | |
 | J.D. Dana - 1855 - 440 pagine
...remarkable locality occurs on the island of Trinidad, where there is a lake of it about a mile and half in circumference. The bitumen is solid and cold near...increases in temperature and softness towards the center, where it is boiling. The appearance of the solidified bitumen is as if the whole surface had... | |
 | Andrew Ure - 1860 - 972 pagine
...different varieties of pure and earthy pitch, or asphaltum, so abundant in the island." The Pitch Lake is one and a half miles in circumference ; the bitumen...softness towards the centre, where it is boiling. The solidified bitumen appears as if it had cooled, as the surface boiled, in large bubbles. The ascent... | |
 | Henry William Bristow - 1861 - 510 pagine
...Trinidad, three miles in circumference, covers an area of 99 square miles, and is of unknown thickness. The Bitumen is solid and cold near the shores, but...softness towards the centre, where it is boiling. The solidified bitumen appears as if it had cooled as the surface boiled, in large bubbles. The ascent... | |
 | James Dwight Dana - 1865 - 498 pagine
...remarkable locality occurs on the island of Trinidad, where there is a lake of it about a mile and half in circumference. The bitumen is solid and cold near...gradually increases in temperature and softness towards Describe bitumen. What is asphaltum? petroleum? naphtha? Wha is said of the asphaltum of Trinidad?... | |
 | James Dwight Dana - 1866 - 466 pagine
...remarkable locality occurs on the island of Trinidad, where there is a lake of it about a mile and half in circumference. The bitumen is solid and cold near...but gradually increases in temperature and softness toward* HO MINKtt U. RESfNS. the center, where it is boiling. The appearance of the solidified bitumen... | |
 | Museum of Practical Geology (Great Britain), Robert Hunt, Frederick William Rudler - 1867 - 188 pagine
...the mountain limestone of this country, and from the celebrated Pitch Lake of Trinidad. This lake is one and a half miles in circumference ; the bitumen...softness towards the centre, where it is boiling. The solidified bitumen appears as if it had cooled as the surface boiled in large bubbles. The ascent to... | |
 | Andrew Ure - 1867 - 1006 pagine
...different varieties of pure and earthy pitch, or asphaltum, so abundant in the island." The Pitch Lake is one and a half miles in circumference ; the bitumen is solid and cold near the shores, bat gradually increases in temperature and softness towards the centre, where it is boiling. The solidified... | |
 | 1867 - 400 pagine
...miles, and is of very great depth. " The bitumen is solid and cold near the shores of the lake, and gradually increases in temperature and softness towards the centre, where it is boiling. The ascent to the lake from the sea, a distance of three-quarters of a mile, is covered with a hardened... | |
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Lake is one and a half miles in circumference ; the bitumen is solid and cold near the shores, but gradually increases in temperature and softness towards the centre, where it is boiling. The solidified bitumen appears as if it had cooled, as the surface... 
