My experiments with volcanoesJaggar, Thomas Augustus
Science
My experiments with volcanoes
Jaggar, Thomas Augustus
Geologists -- Biography; Volcanoes
My first job on arriving in Hawaii was to make contact with Mr.
Thurston and his associates. The next was to get a good map made of
Kilauea Volcano as a basis for measurement of changes in the fire pit.
Governor Walter F. Frear came to my rescue and immediately sent Colonel
Claude Birdseye and Captain Albert Burkland to make a topographic map
of the proposed Hawaii National Park. These engineers brought into the
field the topographic camp of the U.S. Geological Survey, and they were
extremely sympathetic with my project, furnishing me with surveying
monuments, and sketching out methods wherewith to make an accurate base
line for measurement of changes inside the pit.
A laboratory on the northeast edge of Kilauea Crater was quickly
provided through the energy of the brilliant Demosthenes Lycurgus,
hospitable Greek manager of the Volcano House, the hotel where I
stayed. All the merchants of Hilo, thirty miles away, contributed funds
and in a few weeks carpenters were at work, on land belonging to the
Bishop Estate and sublet by the Volcano House. Furniture was paid for
by the Whitney Fund.
A cellar for seismographs was blasted by Territorial prisoners in
the hot rock under the laboratory, at the actual northeast edge
of the greater crater of Kilauea. The lava pit Halemaumau, always
smoking, was in full view two miles away. The cellar lined with
concrete, which shut off the steam cracks, became a warm, dry place
for instruments at a constant temperature of about 80° Fahrenheit.
Concrete tables on the floor of the cellar held the pair of east-west
and north-south horizontal pendulums, recording with delicate pens
on smoked paper, stretched over a chronograph drum. These paper
records, removed every day and fixed with shellac varnish, became the
seismograms of the permanent files. Long belts of wavy lines on each
paper exhibited seconds, minutes, and hours; and when a sharp zigzag
in one of the lines occurred, it was evidence of either a local or a
distant earthquake. H. O. Wood, who had been my assistant in field
geology at Harvard and had had experience with Omori seismographs
at the University of California, was summoned to the Observatory as
seismologist.
Thus in the first six months of 1912 I became a resident of a volcano
in Hawaii and had an adequate laboratory of eight rooms, and suitable
porches, a darkroom for photography, and the beginnings of seismograph
records in the basement. Horses and saddles were purchased, the
necessary outer houses were built, and Alec Lancaster was employed as
janitor and field man. Francis Dodge, athletic young Honoluluan and son
of a government surveyor, was appointed topographic assistant. He was a
hardy cowboy, with some experience as rodman for the Geological Survey.
Public-domain text, read in full here on John Shaqi.
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