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Updated: April 30, 2025
The principle of the electromotograph was utilized by Edison in more ways than one, first of all in telegraphy at this juncture. It related to the use of a retractile spring to withdraw the armature lever from the magnet of a telegraph or other relay or sounder, and thus controlled the art of telegraphy, except in simple circuits.
His tendons are masses of nerve and muscle as hard as steel. The muscular development is tremendous. Vast bands and layers of muscle overlap each other. Strong ligaments, which you can scarcely cut through, and which soon blunt the sharpest knife, unite the solid, freely-playing, loosely-jointed bones. The muzzle is broad, and short, and obtuse. The claws are completely retractile.
He covered the ground in easy lopes that belied his three hundred and twenty-five years, and soon he arrived at the Meeting Place. The mayors of the other villages had been awaiting him since early morning and were shifting impatiently on their haunches. When he clambered up on the rostrum they extended their audio-appendages and retractile fingers and accorded him a round of applause.
In the next two cages, however, are animals who need no prehensile tails; for they are cats, furnished with those far more useful and potent engines, retractile claws; a form of beast at which the thoughtful man will never look without wonder; so unique, so strange, and yet as perfect, that it suits every circumstance of every clime; as does that equally unique form the dragon-fly.
So to keep the claws sharp for use only when the animal wants to seize something, it keeps the claws drawn in at other times. Here I ought to tell you that a dog's claws are quite different from the claws of a feline, even from those of an ordinary cat. The cat's claws are of course retractile, as I have just described to you.
But by injudicious or incessant reproach, this principle, even where it is most exquisite, may be most easily destroyed. The mimosa, when too long exposed to each rude touch, loses its retractile sensibility.
It was probably ill, for its flesh was dry and yellow, but the skin was in excellent condition. Civets belong to the family Viverridae and are found only in Asia and Africa. Although they resemble cats superficially they are not directly related to them and their claws are only partly retractile.
On, deeper and deeper into the wood, now dodging under the green and snaky cat-briers, with their retractile thorns and vicious clinging grasp, now dashing along the woodman's paths, now struggling among the opposing underwood. At last a little sprig of feathery green catches the eye. It is a tuft of moss.
It is then in the earliest or larval state, and assumes its true mite form, being oval in shape, with minute horny jaws adapted for boring, and with two pairs of legs armed with sharp retractile claws. Such an animal as this is little higher than some worms, and indeed is lower than many of them.
Thwaites, Director of the Botanic Garden at Peradenia, who at my request examined their structure minutely, I am indebted for the following most interesting particulars respecting them. "I have been giving a little time to the examination of the land leech. The mouth is very retractile, and the aperture is shaped as in ordinary leeches.
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