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It was all set forth in curves drawn by self-recording pens on regular ruled paper. The student had merely noted what took place in the lecture-room as corresponding to these curves. "At the mention of the noiseless gun," said Kennedy, bending over the record, while the student pointed it out to him and we leaned forward to catch his words, "I find that the curves of Miss La Neige, Mrs.
"They must be self-recording," Rick said thoughtfully, "otherwise the enemy couldn't get the information out of them." "They are. Whatever echo they get makes a tracing inside the box they're mounted on." Scotty objected, "But what kind of information is it? How can anyone tell anything about the subs from such recordings?"
I looked passively at wet and dry bulbs, at self-recording, dotted registers; I caught the fleeting sound of words like "meniscus" and "terrestrial minimum thermometer," and I nodded punctually when Jode went through some calculation. At last I heard something that I could understand a series of telegraphic replies to Jode from brother signal-service officers all over the United States.
Seven times did that series of waves course over our globe, and leave their traces on every self-recording barometer that our earth possesses. Thirty-six hours were occupied in the journey of the great undulation from Krakatoa to its antipodes. Perhaps even more striking was the extent of our earth's surface over which the noise of the great explosion spread.
W. A. Eddy was one of the pioneers, and a very serviceable tailless kite, in which the cross-bar is bowed away from the wind, is his invention, and has been much in use. Mr. Eddy established his kite at Blue Hill the now famous kite observatory and succeeded in lifting self-recording meteorological instruments to considerable heights.
The meteorological investigations took on a more definite shape; the instruments intended for the land base were set up on board ship, including self-recording barographs, thermometers, and a Dines anemometer, with which very satisfactory results were got.
Concerning the night watchman and his duties, although we had so many self-recording instruments, there were certain things which called for attention during the silent hours.
In an ordinary thermometer Mercury freezes hard when exposed to a temperature of 40° below zero. But Barbican had provided himself with a Minimum, self-recording thermometer, of a peculiar nature, invented by Wolferdin, a friend of Arago's, which could correctly register exceedingly low degrees of temperature.
Here the eye travelled over numerous shelves laden with a profusion of self-recording instruments, electric batteries and switchboards, whilst the ear caught the ticking of many clocks, the gentle whir of a motor and occasionally the trembling note of an electric bell.
The most ignorant laborer may get a stone out of the quarry, and the poorest slave unearth a diamond. These intellectual artisans come to their daily task with hypertrophied special organs, fitted to their peculiar craft. Some of them are all eyes; some, all hands; some are self-recording microscopes; others, self-registering balances.
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