I watched
long and with intense interest the gradual change, but I was called
away from it by a consideration of no little practical moment. I must
now be moving at a rate of nearly, if not quite, 40,000 miles an hour,
or about a million miles per diem. It was not my intention, for
reasons I shall presently explain, ever greatly to exceed this rate;
and if I meant to limit myself to a fixed rate of speed, it was time
to diminish the force of the apergic current, as otherwise before its
reduction could take effect I should have attained an impulse greater
than I desired, and which could not be conveniently or easily
diminished when once reached. Quitting, therefore, though reluctantly,
my observation of the phenomena below me, I turned to the apergion,
and was occupied for some two or three hours in gradually reducing the
force as measured by the cratometer attached to the downward
conductor, and measuring with extreme care the very minute effect
produced upon the barycrite and the discometer. Even the difference
between 200 and 201 radii of elevation or apogaic distance was not
easily perceptible on either.
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