Haynes new guide and motorists' complete road log of Yellowstone National Park . SER 13029 ceding eruptions the crater fills to the shore line and boilsfor fifteen minutes. GEOLOGICAL.—^A geyser may be defined as aperiodically erupting hot spring, its water is not volcanicbut simply hot meteoric water; so a geyser is not a volcanoejecting water but a true spring. Were the heat suflBcientand the tube long enough all hot springs would erupt. Sounds like cannonading are heard directly preced-ing a geyser eruption; this is caused by the collapse ofsteam bubbles from the hot region below rising thr
Haynes new guide and motorists' complete road log of Yellowstone National Park . SER 13029 ceding eruptions the crater fills to the shore line and boilsfor fifteen minutes. GEOLOGICAL.—^A geyser may be defined as aperiodically erupting hot spring, its water is not volcanicbut simply hot meteoric water; so a geyser is not a volcanoejecting water but a true spring. Were the heat suflBcientand the tube long enough all hot springs would erupt. Sounds like cannonading are heard directly preced-ing a geyser eruption; this is caused by the collapse ofsteam bubbles from the hot region below rising throughthe cooler strata of water. The surface of the pool, fromwhich the geyser plays, bulges and overflows, and some-times jets of water are thrown upward preceding activity. The famous scientist, E. W. Bunsen, after making acareful study of geyser action by extensive observationand experiment, advanced the following authoritative ex-planation : It is well known that pressure in wpter (being due togravity) increases with the depth; and furthermore, that 80 HAYiNES NEiW GUIDE. ISA LAKE, CONTINENTAL DIVIDE the boiling point rises with the increase in pressure. Thegeyser tube which extends deep into the earth is filled withwater from the higher tracts of land around; the heat isfrom the buried masses of lava not yet cool, lava being sucha great non-conductor and retainer of heat. The typical geyser eruption may be divided into fivestages, namely, (1) the water remains practically station-ary after the tube has filled, and becomes steadily hotter,(2) steam bubbles rising through the cooler strata of wa-ter, collapse, producing the characteristic premonitorycannonading,^^ (3) steam forms below in sufficient quan-tity to cause the surface to overflow, thus the pressure islessened in all parts of the tube, and (4) the great burst ofsteam ensuing, ejects all the water from the tube, (5) thesteam follows and while the tube is filling for another erup-tion, there is no activity other th
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