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But the most easy and habitual manner of determining our want of perpendicularity, is by attending to the apparent motion of the objects within the sphere of distinct vision; for this apparent motion of objects, when we incline from our perpendicularity, or begin to fall, is as much greater than the real motion of the eye, as the diameter of the sphere of distinct vision is to our perpendicular height.
In a week or so it grows to a height of eight or twelve inches with a diameter of an inch and a half or two inches; then its long fringed bracts curl aside, allowing the twenty- or thirty-five-lobed, bell-shaped flowers to open and look straight out from the axis.
On board ship, also, the same principles may be employed with a few changes. An axle is passed through the sides of the ship, with its ends projecting, and wheels are mounted on them, four feet in diameter, with projecting floatboards fastened round their faces and striking the water.
The ponds were now united by a stream of beautifully clear water, and were so far different from those we had left that morning in which the water had a clayey or muddy colour. During this day's journey we killed a snake measuring seven feet in length and eight inches in diameter; and the fat of this reptile was considered a useful addition to a dish at dinner.
Peter doubtfully drew his waghon and split off a piece, which in about a minute was whittled into a short, stout arrow, headed only with a wooden point, the largest diameter of which fitted pretty accurately to the bore of the heavy piece.
In building their dams, the beaver does not thrust the ends of the stakes into the bed of the river, but lays them down horizontally, holding them in place by piling mud and stones upon them. The logs which compose the dams are mostly from six to eight inches in diameter, though some have been found nearly two feet through.
To give our readers some idea of the dimensions of the valve, we may say that the smallest size of trap has 1 in. expansion pipe and a valve 3 in. diameter, the next size 1¼ in. expansion pipe and a valve 4½ in. diameter, and the largest size has a pipe 1½ in. and a valve 6 in. diameter. Altogether, the contrivance has some important practical advantages to recommend it. Mech. World.
A smaller form is common in the Sierra, the fruit of which is eagerly eaten by the Indians and hunters in time of need. In Oregon it forms dense, tangled thickets, some of them almost impenetrable. The largest trunks are nearly a foot in diameter. When in bloom it makes a fine show with its abundant clusters of flowers, which are white and fragrant. The fruit is very small and savagely acid.
It was not intended for play, however, for when it at length came to a termination the spectators under the tree could perceive that a large cavity had been hollowed out in the sand, of such extent, as to diameter and depth, that more than half the flock, when within its circumference, were invisible from their point of observation.
By nine in the morning of May 3, 1715, the obscuration, he tells us, "was about ten digits, when the face and colour of the sky began to change from perfect serene azure blue to a more dusky livid colour, having an eye of purple intermixt.... A few seconds before the sun was all hid, there discovered itself round the moon a luminous ring, about a digit or perhaps a tenth part of the moon's diameter in breadth.
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