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The electrical chronograph is an instrument for measuring minute intervals of time by means of a stylus tracing a line on a band of travelling paper or a revolving barrel of smoked glass. The current, by exciting an electromagnet, jerks the stylus, and the interval between two jerks is found from the length of the trace between them and the speed of the paper or smoked surface.
Better yet, a chronograph which vibrates synchronously with a tuning-fork, whose motion is kept up by electricity, is put in the same place. We then let the shutter fall, when the little stylet will inscribe a certain number of vibrations.
There seemed to be a cuff, a glass chamber full of water into which it fitted, tubes and wires that attached various dials and recording instruments to the chamber, and what looked like a chronograph. "That is my new plethysmograph," remarked Gaines, noting with some satisfaction how Kennedy had singled it out. "I've heard the students talk of it," returned Kennedy.
The two boys moved carefully to the center of the improvised ring, their guards up, while Astro stood off the edge of the mat and watched the sweeping second hand of his wrist chronograph. Shuffling forward Tom pushed out a probing left and then tried to cross his right, but Manning stepped back easily, countering with a hard left to Tom's heart.
He glanced at his wrist chronograph. "The belt is about forty-one hours ahead of us now. Take a rocket scout, look it over, and report back to me." "Yes, sir," said Tom. "Anything else, sir?" "Yes," said Vidac. He stepped closer to the three boys. "This is not a joy ride. I expect you to find a way through that cluster. You have enough time to explore the greater part of it."
We work wholly on planets, and they are taught to find a planet at any hour of the day, to make drawings of what they see, and to determine positions of planets and satellites. With the clock and chronograph they determine difference of right ascension of objects by the electric mode of recording. They have sometimes measured diameters.
In a few moments the three were being carried to the upper floors of the crystal structure by a spiraling band of moving plastic that stretched from the top of the Tower to the many floors below surface level. Tom glanced at his wrist chronograph as they stepped off the slidestairs and headed for Captain Strong's quarters. "We're about twenty minutes late," he said to Roger and Astro.
"You either consent to the regulations, or disqualify yourself from the race." The spaceman's face turned a dusky red under his swarthy complexion. "All right, all right! If that's the way it is, that's the way we'll play it. But I'm warning you, Manning, stay away from me." Strong glanced at his wrist chronograph. "You have five minutes before the blast-off, stand by." He shook hands with Roger.
It would be out of place to describe here the practical adjuncts of a modern equatoreal the adjustments for pointing it, the clock for driving it, the position-micrometer and various eye-pieces, the photographic and spectroscopic attachments, the revolving domes, observing seats, and rising floors and different forms of mounting, the siderostats and coelostats, and other convenient adjuncts, besides the registering chronograph and numerous facilities for aiding observation.
In the central office was a chronograph which registered each discharge in succession. The distances from each cannon muzzle had been obtained by triangulation. In the calm, still night, Commodore Wilkes and Professor Farmer stood in the cupola of the State House with the chronograph, holding their watches, and noting the successive flashes. The experiments were not very satisfactory. Mr.
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