 | 1832 - 852 Seiten
...who visited the spot, supposes that, at the commencement of the eruption , a deep mass of drift snow had been covered by volcanic sand showered down upon...dense stratum of this fine dust mixed with scoriae is an excellent non-conductor of heat, and might he thinks have preserved the snow from complete fusion... | |
 | 1831 - 602 Seiten
...in this locality. We may suppose, that at the commencement of the eruption a deep mass of drift snow had been covered by volcanic sand, showered down upon...fine dust mixed with scoriae is well known to be an excellent non-conductor of heat, and may thus have preserved the snow from complete fusion when the... | |
 | 1830 - 482 Seiten
...a deep mass of drift snow had been covered by volca- "" nie sand, showered down upon it be- ', fore the descent of the lava. A dense stratum of this fine dust mixed with IMPROVEMENT IN PARALLEL RULERS. 440 scoriae is well known to be an excellent non-conductor of heat,... | |
 | 1831 - 460 Seiten
...this locality. We may suppose, that, at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand showered down upon...lava. A dense stratum of this fine dust mixed with scoria; is well known to be an excellent nonconductor of heat, and may thus have preserved the snow... | |
 | 1831 - 644 Seiten
...who visited the spot, supposes that, at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand showered down upon...lava. A dense stratum of this fine dust mixed with scoriœ is an excellent non-conductor of heat, and might, be thinks, have preserved the snow from complete... | |
 | Sir Charles Lyell - 1832 - 634 Seiten
...this locality. We may suppose, that at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand showered down upon...lava. A dense stratum of this fine dust mixed with scoria; is well known to be an excellent non-conductor of heat; and the shepherds in the higher regions... | |
 | 1833 - 1092 Seiten
...extraordinary phenomenon. ' We may suppose that, at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand, showered down upon...fine dust, mixed with scoriae, is well known to be an excellent non-conductor of boat : the shepherds in the higher regions of ./Etna are accustomed to provide... | |
 | 1833 - 1094 Seiten
...suppose that, at the commencement of the eruption, a deep mass of drift snow had been covered byvolcanic sand, showered down upon it before the descent of...fine dust, mixed with scoriae, is well known to be an excellent non-conductor of heat: the shepherds in the higher regions of /Etna are accustomed to provide... | |
 | 1833 - 540 Seiten
...phenomenon. • \Vr may suppose that, at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand, showered down upon...lava. A dense stratum of this fine dust, mixed with scoria', is well known to he an excellent non-conductor of heat : the shepherds in the higher regions... | |
 | David Purdie Thomson - 1849 - 516 Seiten
...Regarding the probable origin of this phenomenon, Sir C. Lyell goes on to observe : — " We may suppose that, at the commencement of the eruption, a deep...this fine dust mixed with scoriae, is well known to bean extremely bad conductor of heat ; and the shepherds in the higher regions of Etna are accustomed... | |
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We may suppose, that, at the commencement of the eruption, a deep mass of drift snow had been covered by volcanic sand showered down upon it before the descent of the lava. A dense stratum of this fine dust mixed with... 
