In fact in its normal position, the vibrator is distant from its contact, and the closing of the circuit would produce no action.
The Vibrator has two small discs, or heads acting through an opening in the couch on which the invalid rests.
The mass of each vibrator is such that it will be easily set in motion, and after the stimulus has ceased it will readily come to rest.
If you wish to remove your tubes and vibrator for test purposes, their location is indicated below.
Make sure that all tubes and the vibrator are pushed well down in their sockets and that all the grid clips are properly in place on the top caps of their respective tubes.
Place the key in about the middle of the table and down in front, and the spark coil to the left and well to the back but so that the vibrator end will be to the right, as this will enable you to adjust it easily.
When a 110 volt direct current is used to energize the power transformer an electrolytic interruptor is needed to make and break the primary circuit, just as a vibrator is needed for the same purpose with a spark coil.
The condenser is placed in the bottom of the box, or on the base, while the vibrator is mounted on one end of the box or on top of the base, and it is the only part of the coil that needs adjusting.
The transformer needs no vibrator when used with alternating current.
The vibrator consists of a stiff, flat spring fixed at one end to the box or base while it carries a piece of soft iron called an armature on its free end and this sets close to one end of the soft iron core.
She took a vibrator from the dresser and stood directly in front of him.
These sparks were not stopped when a large plate of non-conducting substance, such as the wall of a room, was interposed between the vibrator and detector, but a large plate of very thin metal stopped them completely.
Hertz found that when he held his detector in the neighbourhood of the vibrator minute sparks passed between the balls.
No sparks were then observed in the detector when the vibrator was in action.
We can see that this result is a consequence of the large damping of the oscillations of the vibrator and the very small damping of those of the detector.
The radius of the circle for use with the vibrator just described was 35 cm.
To see this let us consider the extreme case in which the oscillations of the vibrator are absolutely dead-beat.
The vibratorconsisted of two equal brass cylinders, 12 cm.
From the open form of this vibrator we should expect the radiation to be very large and the rate of decay of the amplitude very rapid.
Examine both the spark plug and the vibrator of the missing cylinder.
The first symptom of a defective unit is the buzzing of the vibrator with no spark at the plug.
Do not bend or hammer on the vibrators, as this would affect the operation of the cushion spring of the vibrator bridge and reduce the efficiency of the unit.
He was too weak to adjust the vibrator, and without the vibrator the vessel would not rise.
Well, it is because I look upon it as a vibrator and as a pendulum; and surely you would never look for the true action of a pendulum, had it a tendency either to one side or another?
Many types of vibrator are used on induction coils, the most important requirement being that the break occur with great rapidity.
The magnetized core attracts the vibrator which breaks the primary circuit; 3.
The plain coil gives but one spark when the primary circuit is made and broken, while the vibrator coil gives a series of sparks following each other in rapid succession.
Y is the vibrator or trembler and D the center about which it vibrates.
Adjust thevibrator spring so that the hammer or piece of iron on the end of the vibrator spring stands normally about one-sixteenth of an inch from the end of the coil.
In adjusting a multi-unit coil, if any misfiring be noticed, hold down one vibrator after another until the faulty one is located, then screw in its contact screw very slightly.
Adjust the contact screw until it just touches the platinum contact on the vibrator spring--be sure that it touches, but very lightly.
The following general instructions for adjusting a plain vibrator should be carefully noted: 1.
It is a mistake to use a higher voltage than that for which the coil is designed, because it does not improve the spark and the contact points of the vibrator will be burned more rapidly, moreover, the life of the battery will be shortened.
These bushings are elastic to such a degree as to absorb the sharp vibrations of vibrator frame and patterns, while so firm and well fitted as to hold patterns accurately to their position.
The vibrator frame itself is secured to the machine structure by the four larger bolts, the holes for which are shown in the inner corners.
In fact, in changing patterns, the process consists of simply removing these four machine screws, taking up the pattern plate and screwing to the vibrator frame the new pattern plate.
Just as he seizes the pattern drawing lever with his right hand, he presses with his left on the head of a compression valve shown at the left side of top of machine, thus admitting air to the pneumatic vibrator already referred to.
In other words, when the key belonging to battery B and vibrator 1 is depressed (see Fig.
This vibrator is so arranged in relation to the battery that whenever the key belonging to it is depressed the current all through the line is rendered vibratory.
The operation was as follows: One of the wires strung on the poles nearest to the track was fitted up with a vibrator and key at the end of the line similar to that of the Way duplex just described.
So when the voice is correctly focused and delivered, the only change incident to altered pitch is that made in the vibratorso as to give the proper number of vibrations for the pitch required.
The artificial instruments undergo no change when making a tone of higher or lower pitch other than the attuning of the vibratorto the pitch desired.
The switch should then be left on and the vibrator allowed to buzz for several seconds in order that it may be determined whether the pitch of the sound will change, or not.
The contact screw should be set so that the vibrator rests about three-thirty-seconds of an inch from the end of the magnetic core.
When an evenly-pitched, vigorous buzz has been secured, the switch should be thrown on and off several times to make certain that the response of the vibrator is instant and positive.
Thus the actual contact is made against these heat-and-wear-resisting platinum points, and it is evident that upon their proper action depends the formation of the spark in the cylinder with which that particular vibrator is connected.
But if the ignition occurs irregularly when the batteries are delivering the proper amount of current, it is probable that the trouble lies in the pitted condition of the platinum contact points of the vibrator of the coil.
When the switch is thrown on and the motor turned until current flows through the coil, the resulting buzz emanating from the vibrator should be decided and forceful.
A circuit breaker is generally incorporated in the mechanism of a magneto, and consequently when such an instrument is used, the vibrator on the coil is dispensed with.
If the buzz of the vibrator is pitched lower than was formerly the case, it is an indication that the contact point should be screwed down, or that the tension of the vibrator should be tightened.
After the tension of the vibrator has been set to approximately the proper amount, the ear must be trusted for the correct adjustment of the contact screw.
If the vibrator is set too tight, an undue amount of current will be required to magnetize the core of the coil sufficiently to pull the vibrator away from its contact point, and the batteries will soon "run out.
One of these points is placed in the vibrator steel, and the other is embedded in the end of the screw against which the first rests.
If this screw is turned down so that it forces the vibrator toward the iron core, the tension will be greater than will be the case if the contact point is turned to the left.
If this buzz is exceedingly high-pitched, it is an indication that the vibrator has been set too tight, and its tension should be loosened if unscrewing the contact point slightly does not lower the tone.
The larger the body of iron touched to the vibrator the larger the spark.
B is connected to the vibrator and E to point in dark box, the other point to ground.
We found the addition of battery to the Stubb's wirevibrator greatly increased the volume of spark.
We now found that if we touched any metallic part of the vibrator or magnet we got the spark.
The point X of vibrator was now connected to the gas-pipe and still the sparks could be drawn from the stove.
When the wires from the vibrator and the gas-pipe were connected, slight contractions were noted, sometimes very plain and marked, showing the apparent presence of electricity, which from the high insulation seemed improbable.
Normally, the frictional pressure between the drum and pad would carry the latter with the former as it revolved, but if the friction were removed a spring on the end of the vibrator arm would draw it back to its starting-place.
In experimenting with a vibrator magnet consisting of a bar of Stubb's steel fastened at one end and made to vibrate by means of a magnet, we noticed a spark coming from the cores of the magnet.
We now took the wire from the vibrator in one hand and stood on a block of paraffin eighteen inches square and six inches thick; holding a knife in the other hand, we drew sparks from the stove-pipe.
But when we noticed it on this vibrator it seemed so strong that it struck us forcibly there might be something more than induction.
It should be observed, that the smaller vibrator G can be displaced with ease when the nuts K L are withdrawn: and this should be frequently done to examine the progress of the impression.
Then I took another piece of cable, and connected the earth terminal of the vibrator with the telegraph pole.
Cutting across in plain sight of the enemy, we fixed the vibrator to the fence, and called up Heilbron.
I at once attached the vibrator to the line and called up Heilbron.
I grasped the useful little vibrator with one hand, flung the blanket into a corner with the other, and set off, calling to the native servant to follow with a ladder.
The vibrator must respond freely to feeble impulses, and, what is of prime importance, to any vibration rate as readily as to any other.
The ear consists, in the first place, of a vibrator that will respond accurately to any vibration rate or combination of vibration rates within its range, and secondly of a sensitive apparatus that is acted upon by the vibrator.
A stop being drawn and a key pressed down, wind is admitted by a corresponding valve to a reed or vibrator (fig.
There was a fine, fat spark at the plugs, the vibrator buzzed properly, the gasoline feed appeared to be adequate, the carburettor was performing its duty, and the engine did not seem to be overheated.
If the two projecting parts of the vibrator are sawed off with a hacksaw, it can be mounted on the inside of the can.
Circuit Breaker for Induction Coils [101] Amateurs building induction coils are generally bothered by thevibrator contacts blackening, thus giving a high resistance contact, whenever there is any connection made at all.
When the vibrator is not working the armature should be about 1/16 in.
Mount the bell vibrator on the base, using a small block of wood to elevate it to the level of the center of the can, and solder the end of the vibrator rod to the metal.
The rapidly moving armature of the bell vibrator causes the bottom of the can to vibrate with it, thus producing sound waves.
Fasten one secondary electrode to the trap containing the rat and with a wire nail fastened to the other terminal, hold the vibrator of the coil with your finger and let the rat bite on the nail and while doing so release the vibrator.
The vibrator is made of a piece of thin tin to which is soldered the head of an iron screw and on the other side a small piece of platinum, which can be taken from an old electric bell (Fig.
This trouble may be done away with by departing from the old single-contact vibrator and using one with self-cleaning contacts as shown.
When the coil vibrator is used, the condenser C C can be omitted, that of the coil itself serving instead.
No wires seemed to have broken, the current was good, the vibrator buzzed when the contact was made and there was plenty of gasoline in the tank.
She tested the vibrator and found the current good, though at times, when not suffering from a fit of stubbornness, the engine had been known to start with the magneto.
