keeper

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keeper

Physics a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit when it is not in use

keeper

[′kēp·ər]
(electromagnetism)
A bar of iron or steel placed across the poles of a permanent magnet to complete the magnetic circuit when the magnet is not in use, to avoid the self-demagnetizing effect of leakage lines. Also known as magnet keeper.

strike plate, strike, striking plate

A metal plate or box which is set in a doorjamb and is either pierced or recessed to receive the bolt or latch of a lock, fixed on a door. Also see box strike plate.
References in classic literature ?
The keeper quietly proceeded to take out his pipe, fill, and light it, keeping an eye on Tom, who now sat disconsolately across the branch, looking at keeper--a pitiful sight for men and fishes.
I say, keeper," said he meekly, "let me go for two bob?
I'm coming down, keeper," said Tom at last, with a sigh, fairly tired out.
And so Tom descended, and wended his way drearily by the side of the keeper, up to the Schoolhouse, where they arrived just at locking-up.
The keeper spoke for a moment with an official, then opened the iron gates and conducted Andrea to a room on the first floor.
The keeper obeyed, and Don Quixote, fixing on the point of his lance the cloth he had wiped his face with after the deluge of curds, proceeded to recall the others, who still continued to fly, looking back at every step, all in a body, the gentleman bringing up the rear.
They returned at length to the cart, and as they came up, Don Quixote said to the carter, "Put your mules to once more, brother, and continue your journey; and do thou, Sancho, give him two gold crowns for himself and the keeper, to compensate for the delay they have incurred through me.
The keeper, then, in full detail, and bit by bit, described the end of the contest, exalting to the best of his power and ability the valour of Don Quixote, at the sight of whom the lion quailed, and would not and dared not come out of the cage, although he had held the door open ever so long; and showing how, in consequence of his having represented to the knight that it was tempting God to provoke the lion in order to force him out, which he wished to have done, he very reluctantly, and altogether against his will, had allowed the door to be closed.
Sancho paid the crowns, the carter put to, the keeper kissed Don Quixote's hands for the bounty bestowed upon him, and promised to give an account of the valiant exploit to the King himself, as soon as he saw him at court.
It is a strange request," said the keeper, "but for my friend O-Zar I would do even more, though of course--" he hesitated--"it is customary for one who would be chief to make some slight payment.
For the friend of my friend it shall be nominal," replied the keeper, naming a figure that Gahan, accustomed to the high price of wealthy Gathol, thought ridiculously low.
Tell me," he said, handing the money to the keeper, "when the game for the Heliumite is to be played.