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It is the disturbance set up in these spirit-level canals by the pitching and rolling of a ship, which makes us seasick. Neither the stomach, nor anything that we may have eaten, has anything to do with it. In the same way we sometimes become sick and dizzy from swinging too long or too high, or from riding on the cars.
Now, let us rise from this discussion of Kate against libellers, as Kate herself is rising from prayer, and consider, in conjunction with her, the character and promise of that dreadful ground which lies immediately before her. What is to be thought of it? I could wish we had a theodolite here, and a spirit-level, and other instruments, for settling some important questions.
The lawn was an accomplishment in itself, for after she had had the soil sifted to a depth of eighteen inches to clear it of roots and stones, she levelled it herself by the simple means of a spirit-level and a string. It is not to be supposed that all these things grew without immense difficulty.
Jamieson, after making in 1862 several measurements with a spirit-level, has been led to suspect a rise in the lowest shelf of one foot in a mile in a direction from west to east, or from the mouth of Glen Roy to a point 6 miles east of it in Glen Spean.
Well, of course, when very young, Hadria said, one had extravagant notions: one imagined all sorts of wild things about the purposes of the human brain: not till later did one realize that the average brain was merely an instrument of adjustment, a sort of spirit-level which enabled its owner to keep accurately in line with other people.
The principle was that of a huge swinging saloon, moved by hydraulic power, while a man directed the movement by a sort of spirit-level. Previously the inventor had set up a model in his garden, where a number of scientists saw the section of a ship rocking violently by steam. I recall that pleasant day down at Denmark Hill, with all the engineers assembled, who were thus going to sea in a garden.
I leapt up from where I was, and rushed blindly in Ossip's direction. "Where are you coming to, fool?" was his shout as he brandished the spirit-level. "Stand still where you are!" Indeed, Ossip seemed no longer to be Ossip at all, but a person curiously younger, a person in whom all that had been familiar in Ossip had become effaced.
I had observed for a day or two, that the hanging-lamp did not appear to be entirely perpendicular; and, in walking the deck, I had the sensation that I was not treading on a perfectly level surface. Searching the mate's room, I found a spirit-level, and laid it on the floor. There was no doubt of the fact: the berg was undoubtedly tilting on one side.
That was one of the compensating features of mining; if the returns came at all they came quick. Bruce started on, hastening his footsteps until he almost ran. The electrical genius was driving a nail with a spirit-level when Bruce reached the pump-house and Bruce flared up in quick wrath. "Stop that, Banule! Isn't there a hammer on this place?"
The change would, indeed, be very small, so small that you could not detect it by sighting with the plumb-line. But astronomers and surveyors have vastly more accurate instruments than the plumb-line and the eye, instruments by which a deviation that the unaided eye could not detect can be seen and measured. Instead of the plumb-line they use a spirit-level or a basin of quicksilver.
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