As the voltage of alternating dynamos is carried higher the thickness of insulation on their armature coils and consequently the size or number of slots in their armature cores and the size of these cores increase rapidly.
As an example both ways, I will instance the drying of founders' cores where there is only one blow per day.
The cores of an ordinary foundry can be dried by gas in a common sheet iron even in about half an hour; any accumulation of heat after that time would be useless, and a jacketed oven would be of no advantage.
This is known as the "Manchester" type in which the coresare connected at the ends by two yokes--so named from its original place of manufacture at Manchester, England.
The field magnet cores and pole pieces, as well as the armature of a dynamo are subject to eddy currents, that is, induced electric currents occurring when a solid metallic mass is rotated in a magnetic field.
Where the pole pieces are simply extensions of the cores without enlargement, the coils can be slipped over the ends, but some kind of clamping device is necessary to hold them in place, as for instance, the method shown in fig.
The yoke serves to connect the two "limbs," that is, the cores and pole pieces, and thus provide a continuous metallic circuit up to the faces of the pole pieces.
Copper is expensive, while cast iron cores are less expensive than equivalent ones of wrought iron; in this connection, it is interesting to observe how different designers aim at true economy in construction.
The material used in making the cores and their shape.
These coils are wound around a former or template, and are then slipped over thecores before the latter are bolted to the yokes or frame.
It is a most approved method, and one frequently employed in the construction of cores and pole pieces.
Fort Wayne one piece frame with cast welded combined coresand pole pieces.
The more important type of self-exciting machine is provided with electromagnets in which the field of force is "built up" from the residual magnetism of the soft iron or steel cores of the field magnets of the dynamo itself.
In large multi-polar machines the masses of metal in the pole cores and frame are more efficient in dissipating heat than the external surface of the coil.
To reduce this to a minimum the pole pieces and cores are combined into one part and then cast welded into the yoke or frame.
He eats black bread when he has a sou to buy it with; lacking the sou, there are always opportunities to steal an apple, and failing in that, there are apple cores to be picked up on the streets.
Now an American boy of that age would either have dropped the cores upon the floor, or tossed them out of the window without a word to anybody.
The ziggurat in its later and imposing form was built by him, though within its structure were found the cores of earlier and smaller towers, erected by Narâm-Sin and during the pre-Sargonic period.
The precious metal may have been stripped from these and the stonecores thrown aside; but similar work in solid gold or silver would scarcely have escaped the plunderer's hands.
Peel and take out the cores of about four pounds of apples, and let these simmer till they are quite tender in rather more than a pint of water.
Peel and cut out the cores of the apples, and stew them gently in some syrup composed of about half a pound of white sugar and rather more than a pint of water.
They should be peeled and the cores removed, and then stewed very gently in a syrup composed of half a pound of sugar to about a pint and a half of water; add a few cloves to the syrup, say two cloves to each pear.
The cores and windings he'd adapted from a transparent hand-weapon seen in an often-repeated dream--those cores and windings did not make electromagnets.
He had no official standing to lend weight to his claim that lunatic magnet-cores with insanely complicated windings would amount to space-drive units.
Burke believed that his cores and windings were something other than magnets because the "flux" they produced was of a different intensity.
Put them in a round baking dish, and fill thecores with sugar and lemon juice.
Cover the jar with gauze; add more parings andcores occasionally.
The pressure and current coils and their respective coreslie behind the main frame of the meter.
The laminated iron cores placed within these coils are built up from magnetic steel.
Choke coils of this type are wound without iron cores on circular or elliptical center blocks.
Apple postilla is also made by peeling the apples and taking out the cores after they are baked, sweetening with sugar, and beating it up with a wooden spoon till it is all of a froth.
Pare and core the fruit, after being wiped clean; then boil the cores and parings in a little water, till it tastes well.
In this way it is exceedingly useful in cutting out plain cores in half-core boxes.
Two half-cores are made with the plug, first in one and then in the other branch opening.
The L-shaped armatures are hung over the front edge of this block, so that their free ends lie opposite the magnet cores within the block.
As the impedance coils are large, have cores of considerable length, and are wound with two separate though serially connected windings each, their impedance to voice currents is great.
These have hanging upon them large sets of shelves, upon which the cores are placed for baking.
Hanging over the top of the board are several cores on which the resistance wire has been wound, showing the V-shaped heating element.
During this travel the various cores are set, and the molds closed, moving to the point where the men with large ladles pour the mold.
After the coresare wound, they are screwed firmly to the yoke and to the pole pieces, so as to make, for all practical purposes, one whole piece pretty nearly the shape of a horseshoe magnet.
Well, part of this weak current of electricity goes into these wires and travels back round the cores and so makes the magnetism stronger.
His machine consisted of a horseshoe magnet set on a shaft, and made to revolve in front of twocores of, soft iron wound with wire, and having their ends opposite the legs of the magnet.
Shortly after Pixü, the inventors of the times ceased to turn the magnet on a shaft, and turned the iron cores instead, because they were lighter.
Two flattened Leaden Cores to illustrate means of determination of nature of bullet.
The freed leaden cores do, however, sometimes enter the body, and some of the specimens removed have been referred to the use of expanding bullets.
The occurrence of this gross form of fracture is of some interest in relation to the extreme fragmentation sometimes undergone by the hardened leaden cores of the small-calibre bullets.
There are but few published notices of the discovery of English cores of flint, though they are to be found in numbers over a considerable tract of country, especially where flint abounds.
Many of the cores from Spiennes, near Mons, were subsequently utilized as celts; and the same was the case to some extent at Pressigny, the large cores from which have already been described.
Some of the cores found at Spiennes, near Mons, have been thus used, as well as fragments of celts.
The existence of flakes involves the necessity of there having been cores from which they were struck; and as silicious flakes occur in almost all known countries, so also do cores.
In form they much resemble the obsidian cores of Mexico, and it seems not improbable that they are the result of some similar process of making flakes or knives to that which was in use among the Aztecs.
Mr. Smith has replaced more than 500 flakes either on to other flakes or on to implements and cores from the same floor.
The lower abound in fossils, and though hard when falling from the cliffs are broken up by winter frosts, showing the fossils they contain beautifully preserved in the softer sandy cores of the concretions.
On the top of the magnet cores N, S is a smaller magnet D, wound with fine wire for a resistance of about 4935 ohms, the free ends of the coils being connected to the detector terminals.
At first he made a wry face, but, one after another, the skins and the cores disappeared.
And later the three cores were placed on the table next to the skins.
They finish economically with paints, stains and enamels and are highly valued as cores for fine hardwood veneers.
Peel, by pouring boiling water over them, a dozen fine tomatoes, cut them up, throwing aside the hard cores and unripe portions.
Turn off half the liquid and pour the tapioca, which should have been soaked in a warm place, over the apples, when you have filled the hollows left by the cores with sugar and put a clove in each.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "cores" in a variety of sentences. We hope that you will now be able to make sentences using this word.
