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But a fresh field is opened if for the one-direction suspension of pendulum B we substitute a gimbal, or universal joint, permitting movement in all directions, so that the pendulum is able to describe a more or less circular path. The figures obtained by this simple modification are the results of compounded rectilinear and circular movements.
And then Joe went back to the table and ate his breakfast quickly. He wolfed it. He had an appointment to meet that minute speck some 4,000 miles out in space. His appointment was for a very few hours hence. He'd been training for just this morning's effort since before the Platform's launching. There was a great box swinging in twenty-foot gimbal rings over in the Shed.
CC are the high-pressure cylinders; DD the low pressure; EEEE the four parts forming the gimbal ring, to which are fixed in pairs the high and low pressure pistons, GG and FF; HHHH are the chair arms formed with the cylinders carrying pivots, IIII, which latter fit into the bearings, JJJJ, in the gimbal ring.
Happily, the wheel was tied, the rudder hard to port, and as the ship moved, she must, therefore, have turned; and I must have been back to untie the wheel in good time, for when my senses came, I was lying there, my head against the under gimbal, one foot on a spoke of the wheel, no land in sight, and morning breaking.
If a gimbal does not work with equal freedom in all ways, there will be a tendency for the pendulum to lose motion in the direction in which most friction occurs. By wedging up the ring of a gimbal the motion of the pendulum is changed from universal to rectilinear. The use of two little wedges will then convert the apparatus in a moment from semirectilinear to purely rectilinear. Weights.
The word cylinder is used in a conventional sense only, since the cavities acting as such are circular, whose axes, instead of being straight lines, are arcs of circles struck from the center at which the axes of the shafts would, if continued, intersect. The four pistons are carried upon the gimbal ring, which connects, by means of pivots, the two chair couplings.
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