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Updated: May 14, 2025
Conscientiously used, with due regard to its limitations, the pedometer will give a fair approximation of the length of a journey, but a man can no more tell how far he has gone by merely hanging a pedometer in his pocket than he can tell the height above sea-level of an inland mountain by merely carrying an aneroid barometer to the top.
Too much if the internal heat was to rise so high, for in this case we should be baked, not enough to measure the temperature of springs or any matter in a state of fusion. An aneroid barometer, to indicate extreme pressures of the atmosphere.
We again made less than five kilometres; in the two days we had been descending nearly a metre for every kilometre we made in advance; and it hardly seemed as if this state of things could last, for the aneroid showed that we were getting very low down. How I longed for a big Maine birch-bark, such as that in which I once went down the Mattawamkeag at high water!
But over the estuary there must have been a cold upper current blowing, which crippled our balloon, for the aneroid presently told of a fall of 2,000 feet. It was now past noon, and to us the turn of the tide was come. Very slowly, and with strange fluctuations, the balloon crept down till it reached and became enveloped in the cloud below, and then the end was near.
The valley into which we looked was full of brightest sunshine; the mountain above us looked like a cowled monk. In another hour the whole sky was perfectly clear. O that I had kept my faith in my aneroid!
All streams and water-courses flowed in their direction, while their aneroid showed them that they were gradually descending. When they were moving along near the surface of the ground, a delicious and refined perfume exhaled by the blue and white flowers, that had been growing smaller as they journeyed northward, frequently reached their nostrils.
Perhaps three miles away, as the crow flies, from the river, and seventeen hundred and fifty feet above it, as the aneroid gave it, we were already on the watershed, and everywhere in the direction we were travelling the wide-flung draws and gullies of the Fortymile River stretched out, so clear and beautiful a display of the beginnings of a great drainage system that my attention was arrested, notwithstanding my eagerness for the sight that awaited my turning around.
ANEROID BAROMETER. The term Aneroid barometer is frequently used in connection with air- ship experiments. The word aneroid means not wet, or not a fluid, like mercury, so that, while aneroid barometers are being made which do use mercury, they are generally made without.
Across the forward bulkhead was a bookshelf crammed to overflowing with volumes of all sizes, many upside down and some coverless. Below this were a pipe-rack, an aneroid, and a clock with a hearty tick. All the woodwork was painted white, and to a less jaundiced eye than mine the interior might have had an enticing look of snugness.
The following instruments were also carried: Three minimum registering thermometers; one aneroid barometer which was tested and set for me by the United States Weather Bureau; one clinometer; one pocket transit; three compasses; one pedometer; one taffrail log; one pair binoculars; three No. 3A folding pocket Kodaks, sixty rolls of films, each roll sealed in a tin can and waterproofed, and six "Vanguard" watches mounted in dust-proof cases.
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