The black cord still traveled through the wheels unbroken, and the test applied by the galvanometer proved the insulation to be perfect.
If a wire or a nail or a smaller thing is driven through it, and the insulation is spoiled, an instrument called the galvanometer instantly records the fact, and warning is given at all parts of the ship.
Other plates were placed on the opposite side of the waterway and were connected by a wire with a sensitive galvanometer in series to act as a receiver.
The professor pointed out that had the mirror galvanometer been used with a moderate current the cable could have been continued in successful operation.
His telephone receiver provided the wireless experimenters with an instrument of extreme sensitiveness by which they were able to detect currents which the mirror galvanometer could not receive.
Professor Thomson devised his mirror galvanometer to meet this difficulty.
Currents sent from the opposite side were recorded by the galvanometer and the possibility of communication through the water was established.
The lines are made by the highly magnified string of the galvanometer as it moves across the slit in the photographic apparatus in response to the induction currents set up in the heart magnified by the special galvanometer.
The very elaborate and delicate electrocardiograph with the string galvanometer devised by Einthoven is used.
Kennedy was the calmest one of us all as he tapped the little galvanometer significantly with his index finger.
There is one person who sits gripping the carbon electric handle connected with this galvanometer who, to begin with, had a resistance of over sixty thousand.
But when I began to tell of how Rawaruska met her death, of the hypothetical case I have built up by my observations and experiments here in this very laboratory, the needle of the galvanometer started to oscillate downward.
If no galvanometer can be obtained, a simple one can be made by supporting a small compass needle inside a coil composed of about 100 turns of small wire.
A case should be made for the galvanometerwhose inside dimensions correspond to those of the piece N, Fig.
The terminals of the winding on the coil of the galvanometer should be connected to the terminals of the conductor AB, as shown in Fig.
Illustration: Galvanometer as It is Used to Detect the Presence of an Electrical Current (Fig.
The other piece is fastened to a bracket from which the galvanometer is suspended.
The galvanometer can be calibrated with this resistance, which is known as a shunt.
The moving coil of the galvanometeris constructed as follows: Cut from some 1/8-in.
In this way the galvanometerwill not be disturbed when making connections.
When the galvanometer is hung in this way, two binding posts are mounted on the bracket, and connected to the two on the galvanometer.
The arrangement was placed in series with a galvanometer and a battery; when the turnings were struck by electric waves, the resistance between loose metallic contacts was diminished and the deflection of the galvanometer was increased.
Thus the deflection of the galvanometer was made to indicate the arrival of electric waves.
A galvanometer is so arranged that its action swings a mirror from side to side, reflecting a light.
The increase was felt by the galvanometer connected by wires in the music-room, the mirror swung, the light travelled on the scale, the arrow was moved by Dr.
As nearly as I could make out, in this case the galvanometerwas so arranged that its action swung to one side or the other a little concave mirror hung from a framework which rested on the table.
Between the poles of the galvanometer was stretched a slender thread of fused quartz plated with silver, only one one- thousandth of a millimetre in diameter, so tenuous that it could not be seen except in a bright light.
The beam of light focused on the thread in the galvanometer passed to the photographic film, intercepted only by the five spindles of the wheel, which turned once a second, thus marking the picture off into exact fifths of a second.
A galvanometer in the thermo-couple circuit indicates when the balance point is reached, since at this point the galvanometer needle will stand motionless when its circuit is opened and closed.
At this time the galvanometer is thrown in series with SC.
At this time the galvanometer will indicate a balance in the same way as when it was used with a thermo-couple.
A voltaic cell is joined to the parallelogram at the extremities of one diagonal while a moving-coil galvanometer is connected across the extremities of the other diagonal.
The coils of a moving-magnet or tangent galvanometer (see Fig.
A galvanometerenables one to compare electric currents.
The older or moving-magnet type of galvanometer is similar to the galvanoscope mentioned in Art.
Its pole being connected with one end of a galvanometer wire, and its equator with the other end, electricity rushes round the galvanometer from the rotating magnet.
Connecting the ends of one of the coils with a galvanometer, he found that the moment the ring was magnetised, by sending a current through the other coil, the galvanometer needle whirled round four or five times in succession.
In his experiment with the twirling magnet the galvanometer wire remained at rest; one portion of the circuit was in motion relatively to another portion.
But in the case of the twirling planet the galvanometer wire would necessarily be carried along with the earth; there would be no relative motion.
Faraday first satisfied himself that the needle of his galvanometer was caused to swing through the same arc by the same quantity of machine electricity, whether it was condensed in a small battery or diffused over a large one.
Remove all plugs from the commutator, and place all plugs in the rheostat, as any employed resistance in the rheostat will be in circuit with the galvanometer and the battery.
Now, press both keys and note the direction of the deflection of the galvanometer needle.
The known resistance is put in circuit with the galvanometer and after noting the deflection, the key is moved so as to cut out the known resistance and throw into circuit the unknown resistance.
Upon what does the sensibility of a tangent galvanometer depend?
The deflections produced by this galvanometer are proportional to the current.
In the direct reading type, the scale is so cut that when the galvanometer is balanced, the pointer of the instrument indicates the value of the resistance between the X posts.
Does the astaticgalvanometer give correct readings for different values of the current?
The battery key has single contact, but the galvanometer key has double contact; depressing it closes the galvanometer circuit, and releasing it short circuits the galvanometer, bringing the latter quickly to rest.
It is used in the "nil" or zero methods, in which the current between the points to which the galvanometer is connected is reduced to zero.
The battery is wired to the top leaves of the key and the galvanometer to the lower leaves.
Coincidental with this obsession, the galvanometer showed a tremendous and permanent fluctuation, indicating that the resistance of the body to the current had suddenly and greatly changed!
Will it affect the galvanometer needle, or other delicate electrical or physical instruments?
The galvanometer needle showed what slight variations in the current there were during the course of the treatment.
This fact led to the introduction of the movable coil galvanometer which was first devised by Lord Kelvin as a telegraphic signalling instrument but subsequently modified by A.
Mather have designed a universal shunt box or resistance which can be applied to any galvanometer and by which a known fraction of any current can be sent through the galvanometer when we know its resistance (see Jour.
This metal disk galvanometer has been made sufficiently sensitive to detect the feeble oscillatory electric currents set up in the receiving wire of a wireless telegraph apparatus.
If the latter condition is fulfilled the galvanometer is said to be "dead-beat.
The movable coil galvanometer has the great advantage that it is not easily disturbed by the magnetic fields caused by neighbouring magnets or electric currents, and thus is especially useful in the electrical workshop and factory.
Other important qualifications of a galvanometer are its time-period and its dead-beatness.
In the practical construction of the suspended needle fixed coil galvanometer great care must be taken with the insulation of the wire of the coil.
In course of time both the original form of single needle galvanometer and mirror galvanometer were improved by introducing the astatic principle and weakening the external controlling magnetic field.
This last term is defined as the logarithm of the ratio of one swing to the next succeeding swing, and a galvanometer of which the logarithmic decrement is large, is said to be highly damped.
The third wire is for the indication of the contacts, and is taken from all the instruments to the galvanometer in the home station.
A galvanometer on a plan due to Professor James Clerk Maxwell, employs a permanent magnet, or an electro-magnet, which is stationary, between the poles of which may freely turn a coil bearing the current to be measured.
Lord Kelvin’s recording apparatus for such a cable is a galvanometer on this principle.
Observations concerning the effect of light upon the conductivity of selenium had employed the galvanometer solely; it occurred to me that the telephone, from its extreme sensitiveness, might be substituted with advantage.
His mirror galvanometer was the first instrument that could be applied with anything like satisfactory results to submarine telegraphy.
For some time after the cable was laid he remained at Valentia, endeavouring to bring his galvanometer to still greater perfection.
The needle of the galvanometer remains in equilibrium if the two currents yield equal quantities of electricity during one and the same time, [tau].
Thus a sensitive galvanometer will show a weak current if a copper wire connected in circuit with it be warmed at one point.
If the coil be closed through a small galvanometer G the movements of the needle to one side or the other will indicate these temporary currents.
The needle of the galvanometer is deflected by it, until the resistance in the box R is adjusted to balance that in the rod.
When this is so, the galvanometerneedle remains at rest.
A brass sliding piece S puts the galvanometer needle in and out of action.
In other meters the current passes through a species of galvanometer called an ampere meter, and controls a clockwork counter.
A small galvanometer G shows the indications of the testing current.
A sensitive pile is also a delicate detector of heat by virtue of the current set up, which can be measured with a galvanometer or current meter.
But the galvanometer of Professor Thomson, that instrument of marvellous delicacy, drew faint whispers from its muttering lips.
One end was then connected with the apparatus for transmitting the electric current, and on a sensitive galvanometer being attached to the other end, the whole cable was tested from end to end, and found to be perfect.
I have already shown you how this can be done by means of either a galvanometer or a telephone in circuit with a spiral wire.
It is to be regretted that so sound a reasoner and so careful an experimenter had not the great advantage of the assistance of such suitable instruments for this class of research as the mirror-galvanometer and the telephone.
My desire is that all present should see these results, and with that view I will try when practicable to use a mirror reflecting galvanometer instead of a telephone.
One of these helices was connected with a galvanometer and the other with a battery of a hundred pairs of plates four inches square, with double coppers and well charged.
But the instant the plate moved the galvanometer was influenced, and by revolving the plate quickly the needle could be deflected ninety degrees or more.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "galvanometer" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: indicator; instrument; meter
