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Updated: June 25, 2025
At noon the barograph curve turned up and the wind moderated, the sky gradually clearing. To-night it is fairly bright and clear; there is a light south-westerly wind. It seems rather as though the great gales of the Westerlies must begin in these latitudes with such mild disturbances as we have just experienced.
This had the effect of checking her momentum, just as the aviator checks the downward rush of his monoplane or biplane when he is making a landing. Tom repeated this maneuver several times, until a glance at his barograph showed that they had but a scant sixty feet to go. There was time but for one more upward throwing of the WHIZZER's nose, and Tom held to that position as long as possible.
Which way are you steering?" asked Paul, as he came back from a trip to the dining-room buffet, where he had helped himself to a sandwich, a little lunch having been set out by Innis, who constituted himself as cook. "You're heading East instead of West, Dick," for the young millionaire was at the steering-wheel. "I know it," replied the helmsman, as he noted the figures on the barograph.
We made good use of the time. The first thing to be done was to put our meteorological station in order. On April 1 all the instruments were in use. In the kitchen were hung our two mercury barometers, four aneroids, barograph, thermograph, and one thermometer. They were placed in a well-protected corner, farthest from the stove.
On and on they flew toward the mighty snow mountains which towered like guardian giants ahead of them. The barograph showed that after some hours of flying they had now attained a height of two thousand feet, which was sufficient to enable them to clear the ridge. Viewed from above, the snow mountains looked like any other mountains.
The meteorologist had got his recording station, containing anemometer, barograph, and thermograph, rigged over the stern. The geologist was making the best of what to him was an unhappy situation; but was not altogether without material.
In the last chapter we saw how the ordinary mercurial barometer can be used to ascertain fairly accurately the height of mountains. But the airman does not take a mercurial barometer up with him. There is for his use another form of barometer much more suited to his purpose, namely, the barograph, which is really a development of the aneroid barometer.
Tom, noting the barograph, and seeing that they were twenty-two hundred feet high, decided to keep at about that distance from the earth. "How fast are we going?" cried Dr. Hendrix, into the ear of the young inventor. "Just a little short of a hundred an hour!" Tom shouted back. "We'll hit a hundred and five before long."
It was an uncanny feeling. The occupants of the machine felt a chilling sense of complete isolation. Thanks to their barograph, however, they could judge their height above the sea. "Good thing we've got it," commented Jimsy; "otherwise we might have a thrilling encounter with the topmasts of some schooner."
"Wrong," said Jack, glancing at the barograph on the dashboard in front of him. "We have reached two thousand eight hundred feet." "I must be asleep," said Tom, frowning. "Shall I connect the alternator?" Jack nodded and prepared to send greetings to his father, hundreds of miles away. They were out in the country now.
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