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By now engaging the point with the beginning of the grooved record so formed, and by again rotating the cylinder, the undulations of the record would cause the needle and its attached diaphragm to vibrate so as to effect the reproduction. Such an apparatus was necessarily undeveloped, and was interesting only from a scientific point of view.
Dickie had to stoop to it. Mr. McRittie's arguments were a series of nails that he knocked into the table, and he did it in a workmanlike manner. Mr. Dickie, though he kept firm on his feet, swayed his body until by and by his head was rotating in a large circle. The mathematical figure he made was a cone revolving on its apex.
In order to make them fit in with the hypothesis of successive separation from a rotating and contracting body, certain arbitrary assumptions have to be made of fluctuations in the distribution of the matter forming that body at the various epochs of separation. Such expedients usually merit the distrust which they inspire.
Building a parallel speed equal to that of the rotating dome, he followed it over in a dizzy whirl; and as the rent came below he shot curving down and in with sufficient precision, and at once swiftly adjusted his gravity to offset the asteroid's great centrifugal force.
Faraday's invention of the first dynamo is interesting because at the same time he made the invention he solved a problem which up to his time had been the despair of the ablest physicists and mathematicians. This was the phenomenon of Arago's rotating disc.
Schiaparelli's discovery, if it were received as correct, would put Mercury, as a planet, in a class by itself, and would distinguish it by a peculiarity which had always been recognized as a special feature of the moon, viz., that of rotating on its axis in the same period of time required to perform a revolution in its orbit, and, while this seemed natural enough for a satellite, almost nobody was prepared for the ascription of such eccentric conduct to a planet.
It is desirable, whenever practicable, to provide a rotating or stirring device, since, for example, the time consumed in the deposition of the amount of copper usually found in analysis may be reduced from the 20 to 24 hours required with stationary electrodes, and unstirred solutions, to about one half hour. Carefully heat to boiling and boil for a minute or two to expel nitrous fumes.
The red car moved as smoothly as if nothing had happened. Next was made the momentous discovery that each wore a shirt with the identical lavender stripe. "Initials!" said Bean, pulling up the sleeve of his coat and rotating his fore-arm under the Pitcher's approving glance. "Got mine tattooed the same way," said the Pitcher, pulling up the sleeve of his coat in turn. They discussed shirts.
If those stars did not originate in a manner quite unlike the origin of the sun, then the existence of planets in their neighborhood is almost a foregone conclusion, for the sun could hardly have passed through the process of formation out of a rotating nebula without evolving planets during its contraction.
The nebula was always rotating and always contracting. And as it behaved, so did the planets in their turn; they spun round and cooled and contracted, and the moons were flung off from them, just as they the planets had been flung off from the parent nebula.
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