A on which the bobbins are fixed, is fitted a split collar formed of two halves B and C, to which are joined respectively the ends of the wires + and -.
This armature, in the Siemens dynamo, is composed of a disc having as many bobbins on the periphery as there are magnets on each side of the dynamo.
If we let the bobbins get smothered in oil, the insulating material on the wire will get rotted, and a short circuiting will probably take place.
The rovings, which have previously been prepared, are each passed from the bobbins seen on the lower creel, through a number of grooves on one of the bars which run across the frame, as seen in the illustration.
Here the cops from the mule, or the bobbins from the ring frame, are fitted in a suitable creel, as shown clearly at the front and lower part of our illustration.
At the doubling mill these threads are submitted to finishing processes, by which they may be polished and cleared and finally wound upon small bobbins or spools ready for the market, as seen in Fig.
The beam warping frame, in which perhaps 400 threads are pulled from the bobbins made at the winding frame, and wound side by side upon a large wooden beam.
This is a simple but very extensively adopted process, in which yarn is wound from cops, bobbins or spools into hanks.
If no fresh roving from the rollers were issuing for the moment, the small portion of thread reaching from the rollers to the bobbins would simply be twisted without any "winding-on" taking place.
When this can was filled, it was carried to a winding frame, by which the roving was wound upon bobbins suitable for the spinning frame.
The points which demand some little attention at our hands, are the methods and mechanism involved in twisting the attenuated roving, and winding it upon bobbins or spools in suitable form for the next process.
There is also an arrangement of the mechanism for guiding and shaping the yarn upon the bobbins in suitable form, the action being as nearly as possible an imitation of the mule.
In the spooler, bobbins are placed upon holders or spindles, and the thread is passed over a series of guides to the spool, up above.
The operator must watch for broken threads, retie them, replace the empty bobbins by full ones and see that the empty ones are gathered up uninjured.
The bobbins holding the roving are placed directly over the spindles.
When yarns are singed, the threads are passed through the flame very rapidly, being unwound from one set of bobbins and wound up on another.
At the latter of these towns I had already seen a single toothed-wheel, which set in motion up to a thousand of these tiny bobbins on which are wound the twisted slips of silk.
The perpendicular movement of all these little bobbins is looked after by women, and even children.
After drying it is transferred to the shuttles and bobbins by means of the wheel described in the previous paragraph or by a more primitive device, called ololau (Fig.
The thread is drawn from bobbins on the floor, and is first fastened to peg No.
The loop of threads from the sizing frame is laid on the hooks, from which it is drawn by hand onto the bobbinsand shuttles.
In making the pattern of a piece of nice lace from two hundred to eight hundred bobbins are sometimes used.
This paper is fastened on the cushion, and then pins are stuck in through all the pin-holes, and then the thread from these bobbins is woven around the lace.
There is a cluster of bobbins hanging down one side of the cushion which are wound with threads, and these threads she weaves around the pins in such a manner as to make lace.
During the unrolling of the core from the drum, it was wound tightly round by a serving of hemp, saturated with a composition made chiefly of pitch and tar, the winding being effected by revolvingbobbins as the core was drawn along.
The table turned with great rapidity, and carried near its circumference eighteen bobbins or drums.
The spinners have 104 bobbins on one side of a frame, and watch for breakage, and change the bobbins on three frames, or six "sides.
In winding the filling bobbins the girls watch the thread from eighteen bobbins, and replace and stop bobbins by pressing on foot pedals.
In replacing the bobbins and fastening the broken threads with a knot tier, the girls have to stoop down almost to the floor.
The work is lightened for her by the fact that whereas she formerly placed the bobbins on the warp, doffers now do this for her.
So that in changing bobbins alone the girls have to stoop down over 2000 times a day, without counting all the stooping for knot tying, which the forewoman said would about equal the labor of bending and working at bobbin changing.
The yarn is carried from the spinners to the spoolers, and wound from bobbins to spools for convenience in handling.
The bobbins run out very rapidly, and require constant change.
The speeders had helpers who used to assist them to thread the back of the machine and to remove and place the bobbinsin front.
In the winding room girls are engaged at machines which wind the yarn from spools back to bobbins for filling in the looms and also for the warp.
The mounting adopted by Mr. Carpentier permits of an easy removal of the bobbins and of an instantaneous substitution therefor.
At Ypres, the ground is square meshed, but the bobbins are twisted four times.
The bobbins are flattened in shape so as to pass conveniently between the warps.
The supply of warp threads is held upon reels, the bobbins carrying their own supply.
Real lace of any kind worked with a needle, on a parchment pattern, and not with bobbins or on a pillow.
In Courtrai and Menin, the bobbins are twisted three and a half times, and in Bruges three times.
The worker begins by interlacing the bobbins, which are used in pairs, placing small pins in all perforations, and crossing the bobbins after the insertion of each pin.
From right to left the thread is bound lightly upon the bobbins and tied at the top of each in a loop that permits it gradually to slip off the bobbin when gently pulled, as occurs generally when working.
Little Agostina Valente, bending over her cushion so earnestly, engaged in giving her sister a lesson, has been more fortunate, and is now an expert weaver, frequently working more than one hundred bobbins for a single pattern.
Luigina Gardella--that is the little genius's name--can now work seventy or eighty bobbins at a time.
When extra large diameter roving bobbins are used and the creels are required to take double roving, the 39-in.
Jack Shaft makes, and the spindles and bobbins will be running at the same speed, no winding taking place.
Its speed changes as the bobbins increase in diameter, being governed by the position of the cone belt, which is shifted slightly as each layer is put on the bobbins.
Winding is produced by the bobbins running faster than the spindles, therefore Q, which is driven from the bottom cone through carrier gears, must revolve.
At P and R are seen guide bobbins that serve to put in their normal direction the films that have been used.
It is necessary at each new experiment to use a new band of film, and the substitution of rolls of films is effected in the light by means of bobbins upon which the film is rolled.
Let us suppose that the two bobbins are in place, as shown in cut.
Two springs press against the spindle, and pick up the current generated by the motion of the iron bobbins before the poles of the magnet.
In cases where many bobbins have to be wound, either for bells, for relays, or for indicator coils, a device similar to that illustrated at Fig.
The wire to be wound on the bobbins is sold by all dealers in electrical apparatus.
Of course, if the operator has any skill at winding, he may wind both bobbins with one continuous length of wire, thus avoiding joins, taking care that the direction of the winding in the finished coils be as shown at Fig.
The ends of the wire on the bobbins are brought out and fastened to insulated portions of the spindle, and revolve with it.
There are some persons who are clever enough to make firmbobbins out of brown paper (like rocket cases), with reel ends, that can be slipped off and on the magnet cores.
If this tube be afterwards well covered with melted paraffin wax, the plan answers admirably, but of course the bobbins become fixtures on the magnets.
When the bobbins have been wound, they may be slipped over the magnet cores.
The holes throughout the bobbins should be of a size to fit the iron cores exactly, and the cores should project 1/8 of an inch above the end of the bobbins when these are fitted on.
The helix ends of the bobbins should stand uppermost, as shown at Fig.
Two bobbins of insulated wire are fitted on the cores, and the magnet is held in its place by a transverse strip of brass or iron secured by a wood screw passing between the two bobbins.
Nor need this roving be re-drawn, by rollers, before it is twisted: for it is the property of the bobbins D E, fig.
The two vertical cores, over which the field bobbins are slipped, are of wrought iron, and are turned with a shoulder at either end, the yokes being recessed to fit them exactly.
Hanks of yarn and reels hang from the rafters; baskets of bobbins stand beside the looms.
A winding-wheel and bobbins on the floor between table and loom.
And you know better'n the police where the thieves are among the weavers, that keep back two or three bobbins full every week.
This looks very much as if half the weft had stuck to the bobbins again.
Well, and I would rather see her wearing out her eyes over her favorite books than over twisting her bobbins from morning till night.
In this type the arms carrying the bobbinsare somewhat shorter, allowing for a great rate of speed.
It is all like a Maypole, and the bobbins go in and out like children carrying each its ribbon.
These are led from the bobbins in toward the center, and pass into the column, which carries also the core and which in its turning twists the strands together.
At the ends of these the bobbins are rigged, carrying the strands which are to be twisted into rope.
These human hands were swift, too, as when they thrust the bobbins of roving on the ring-spinning frames to be twisted into yarn.
The little bobbins of thread are thrown around the pins.
The little attachment near the wheel is for windingbobbins for the shuttle.
The great revolving disc, seven or eight feet in diameter, is set round with ironbobbins filled with the iron sheathing wires.
A circular disc or frame, carrying on one face a series of bobbinswhich hold the threads of the yarn, is kept revolving.
These bobbinsare suspended on the face of the disc, so that as the disc revolves they always preserve their fixed position with respect to the earth.
If, however, the natural time periods of these bobbins do not lie very far apart, then a faint luminosity will make its appearance in both the vacuum tubes.
Supposing, therefore, that we connect to the oscillating circuit of the jar a number of bobbinshaving different time periods of oscillation, like organ-pipes, and supply them all with one common alternating electromotive force.
If we connect one side of the jars to the earth and the other side to the foot of one of the spirals or bobbins above described, we shall find perhaps that the vacuum tube at the other end is not rendered luminous.
These bobbins can have let down into them an =E=-shaped piece of laminated iron, so as to complete the magnetic circuit, and thus raise the inductance of the bobbin.
Each of these bobbins has a certain electrical capacity with respect to the earth, when considered as an insulated conductor, and it has also a certain inductance.
The wires of the two bobbins of the electro-magnet end in two clamps, 1 and 2.
We shall call primary bobbins those which are interposed in the principal line, and secondary bobbins those in which the inducting current is a secondary one, and so on.
Upon these latter there is laid a mixture of sand and asphalt, and then the wires and bobbins are put in, and the whole is finally covered with a new insulating layer.
The induction is effected by the aid of bobbins whose interior consists of a bundle of soft iron.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "bobbins" in a variety of sentences. We hope that you will now be able to make sentences using this word.
