The Land of Thor

by J. Ross Browne

It did not appear to me that the height of the fountain was so great as it is generally represented. So far as I could judge, the greatest altitude at any time from the commencement of the eruption was not over sixty feet. Its volume, however, greatly exceeded my expectations, and the beauty of its form surpassed all description. I had never before seen, and never again expect to see, any thing equal to it. This magnificent display lasted, altogether, about ten minutes. The eruption was somewhat spasmodic in its operation, increasing or diminishing in force at each moment, till, with a sudden dash, all the water that remained was ejected, and then, after a few gurgling throes, all was silent.

I no longer attempted to sleep. My mind was bewildered with the wonders of the scene I had just witnessed. All I could do was to make a cup of tea at the big boiler on the slope above my tent, and walk about, after drinking it, to keep my feet warm. Soon the sun’s rays appeared upon the distant mountains. A strange time of the night for the sun to be getting up—only half past one—when people in most other parts of the world are snug in bed, and don’t expect to see a streak of sunshine for at least four or five hours. How different from any thing I had ever before seen was the sunrise in Iceland! No crowing of the cock; no singing of the birds; no merry plow-boys whistling up the horses in the barn-yard; no cherry-cheeked milk-maids singing love-ditties as they tripped the green with their pails upon their heads. All was grim, silent, and death-like. And yet surely, for all that, the delicate tints of the snow-capped mountains, the peaks of which were now steeped in the rays of the rising sun, the broad valley slumbering in the shade, the clear, sparkling atmosphere, and the exquisite coloring of the Langarfjal—the mighty crag that towers over the Geysers—were beauties enough to redeem the solitude and imbue the deserts with a celestial glory.

There are various theories concerning the cause of these eruptions of water in Iceland. That of Lyell, the geologist, seems the most reasonable. The earth, as it is well known, increases in heat at a certain ratio corresponding with the depth from the surface. There are cavities in many parts of it, arising from subterranean disturbances, into which the water percolates from the upper strata. In Iceland the probability is that these cavities are both numerous and extensive, owing to volcanic causes, and form large receivers for the water of the surrounding neighborhood. Wherever there is a natural outlet, as at the Geysers, this water, which is boiled by the heat of the earth, is forced to the surface by compression of steam, and remains at the mouth of the pipe, or shaft, until an accumulation of compressed steam drives it up in the form of a fountain. The periodical occurrence of these eruptions in some of the hot-springs and not in others may arise from a difference in the depth of the receiver, or more probably from the existence of several outlets for the escape of steam in some, and only one in others. A good illustration of this theory is presented in the boiling of an ordinary tea-kettle. When the compression of steam is great, the cover is lifted up and the water shoots from the spout, by which means the pressure is relieved and the water subsides. The same thing is repeated until the space within the kettle becomes sufficiently large to admit of a more rapid condensation of the steam. The action of the Strokhr, which, as I have shown, differs from that of the Great Geyser, may be accounted for on the same general principle. The foreign substances thrown in on top of the boiling water stops the escape of steam, which, under ordinary circumstances, is sufficiently great not to require the periodical relief of an eruption. An accumulation of compressed steam takes place in the reservoir below, and this continues until the obstruction is ejected.

GREAT GEYSER AND RECEIVER.
STROKHR AND RECEIVER.

This, I believe, is substantially Lyell’s theory; though, having no books by me at present, I quote entirely from memory, and it is possible I may be mistaken in some of the details. The preceding diagrams will enable the reader to understand more clearly the whole process by which these eruptions are produced.

Six long hours remained till ordinary breakfast-time. What was to be done? It was getting terribly lonesome. I felt like one who had been to a theatre and seen all the performances. Zöega had promised to be back by eight o’clock; but eight o’clock in Iceland, on the 21st of June, is a late hour of the day. A treatise on trigonometry might be written between sunrise and that unapproachable hour. The only thing I could do was to make some more tea and eat a preliminary breakfast. When that was done nothing remained but to go to work in front of my little tent and finish up my rough sketches. This is a very absorbing business, as every body knows who has tried it, and I was deeply into it when Zöega made his appearance.

“Well, sir,” said he, “what success? Did he erupt?”

“Of course he erupted, Zöega. You didn’t suppose a Great Geyser would keep a gentleman all the way from California waiting here an entire night without showing him what he could do?”