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Updated: May 14, 2025
Levelling may be read from a contour map, if there is such available. In most countries it must be done by reading feet on an aneroid barometer, set with zero of level scale to 30 ins. or 760 mm. Then visit as soon as possible some point where a level is marked on the map, as a hill top, and read the barometer. This will give the correction to be made to all the previous notes.
Tucker's aneroid read more than a thousand feet higher, 22,550 feet, but even this fell short of Raimondi's estimate of 22,775 feet, and considerably below Bandelier's "23,000 feet." This was a keen disappointment, for we had hoped that the aneroids would at least show a margin over the altitude of Mt. Aconcagua, 22,763 feet. This discovery served to dampen our spirits still further.
I wonder what the weather's doing'; he rose, glanced at the aneroid, the clock, and the half-closed skylight with a curious circular movement, and went a step or two up the companion-ladder, where he remained for several minutes with head and shoulders in the open air.
I had still strength to tap the aneroid barometer to facilitate the movement of the needle. Sivel had just raised his hand towards the sky. As for myself, I remained perfectly still, without suspecting that I had, perhaps, already lost the power of moving. About the height of 25,000 feet the condition of stupefaction which ensues is extraordinary.
It is wise to practise this on clear days in order to get accustomed to running by map, compass and aneroid. As the weather also affects the aneroid, it should be constantly reset at known levels. All this may sound very confusing, and most beginners will probably prefer to take a Guide who knows his country well rather than trust to elementary map-reading knowledge in unknown country.
You had better rise a bit, and don't go too fast, or we may be knocking our noses before we know where we are." "Right O, mister," replied the Frenchman. "You take forty winks, and eat some chocolate for what you call a nightcap." "A good idea. I'd rise to about 4,500 feet, I think. Keep your eye on the aneroid." They exchanged places.
As for the fields, stretched out in illimitable extent, far as the eye could reach, they seemed to form a gigantic carpet, with patterns chiefly diamond-shaped, and in colour shaded from bright emerald to russet brown. "This won't do," the captain said again, and seizing a bag of ballast he emptied it. The balloon swiftly rose, and the aneroid marked 2,500 feet.
After dinner a busybody in the shape of a too intelligent young coffee-planter, who possessed an aneroid barometer, brought that instrument to the smoking-room with a scared face. The needle was deflected to a part of the dial which the intelligent young planter had hitherto considered to be merely ornamental and not intended for practical use.
Captain Holt took a look at the sky, the aneroid and the wind not the arrow; old sea-dogs know which way the wind blows without depending on any such contrivance the way the clouds drift, the trend of the white-caps, the set of a distant sail, and on black, almost breathless nights, by the feel of a wet finger held quickly in the air, the coolest side determining the wind point.
The Religious Tract Society, and various publishers, made a grant of books to form the nucleus of a free lending library; the National Lifeboat Institution presented an aneroid barometer, and Messrs. Hewett and Company made a present of the insurance premium of 50 pounds.
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