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Although among the commonest of the species, the grey sand crab, which burrows bolt-holes in the beaches, is by no means an uninteresting character. Surrounded by enemies, and yet living on the bare, coverless beach, its faculties for self-preservation are exceptionally refined. The eyes are elongated ovals, based on singularly mobile pivots, while the pupils resemble the bubble of a spirit-level.
The shape of the gun had been made to conform to the strains brought by the discharge upon its various parts, as determined by careful experiment; and in place of the 32-pounder, or six-inch gun, which had been the principal weapon of the earlier ships, the batteries of the new frigates and sloops were composed chiefly of nine-inch guns, with one or more pivots of ten- or eleven-inch bore.
D is one of the pivots a corresponding one being on the other side by which the hopper is supported, and on which it vibrates. a, a, a, a, a, a, are the parts of the framework, the dimensions of which in feet and inches are given.
As these patriotic maxims were pronounced by General Hawley, the whole Convention broke forth in prolonged applause. The platform, reported on the second day, succinctly stated the Republican policy. It made two principles conspicuous: first, equal suffrage; and second, the maintenance of the public faith. These were the pivots on which the political controversy of the year turned.
"That question would provide an interesting subject for debate at the Carlton, my dear," he replied with equal asperity. Suddenly the passengers still seated experienced a prolonged sinking sensation, as if the vessel had been converted into a gigantic lift. They were pressed hard into their chairs, which creaked and tried to swing round on their pivots.
Suddenly he spoke to the woman. "Open the portal," said he. She stepped to the oval window, touched a latch, and swung the pane horizontally upon two pivots. Immediately the room was flooded with a strange effulgence, amber-like, soft and mellow, as real sunshine. But it was NOT real sunshine!
At Castle Ashby, Northants; Fountains Hall, near Ripon; Ashes House, near Preston; Trent House, Somerset; and Ockwells, Berks, are panels opening upon pivots and screening small cavities in the walls. Horsfield, in his History of Sussex, gives a curious account of the discovery in 1738 of an iron chest in a recess of a wall at the now magnificent ruin Hurstmonceaux Castle.
And other reasoners, who distrust this bare philosophy, have propounded subtle arguments to prove that these dignified parts of old Governments are cardinal components of the essential apparatus, great pivots of substantial utility; and so they manufactured fallacies which the plainer school have well exposed. But both schools are in error.
Avoid the burnish file at all hazards; it will not leave the pivot round, for the pressure is unequal at various points in the revolution. A pivot that was not perfectly round might act fairly well in a jewel hole that was round, but unfortunately the greater proportion of jewel holes are not as they should be, and we must therefore take every precaution to guard against untrue pivots.
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.