It was
obviously necessary also to repel or counteract the attraction of any
body which might come near me during the voyage. Again, in getting
free from the Earth's influence, I must be able to steer in any
direction and at any angle to the surface. For this purpose I placed
five smaller bars, passing through the roof and four sides, connected,
like the main conductor, with the receptacle or apergion, but so that
they could revolve through a much larger angle, and could at any
moment be detached and insulated. My steering apparatus consisted of a
table in which were three large circles. The midmost and left hand of
these were occupied by accurately polished plane mirrors. The central
circle, or metacompass, was divided by three hundred and sixty fine
lines, radiating from the centre to the circumference, marking as many
different directions, each deviating by one degree of arc from the
next. This mirror was to receive through the lens in the roof the
image of the star towards which I was steering. While this remained
stationary in the centre all was well. When it moved along any one of
the lines, the vessel was obviously deviating from her course in the
opposite direction; and, to recover the right course, the repellent
force must be caused to drive her in the direction in which the image
had moved.
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