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Updated: May 20, 2025
The core, primary and secondary coils form a unit and these are set in a box or mounted on top of a hollow wooden base. 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.
So far nothing has been put in general service which meets this demand, but lately there have been experiments with the telephone, which, it is said, can be used without wires, by which signals can be projected by a vibrator on one vessel against a receiver on another.
Ignition was obtained by using a one-spark coil and vibrator for all cylinders, with a distributor to select the right cylinder for each spark this was before the days of the high-tension magneto and the almost perfect ignition systems that makers now employ.
A condenser is connected across the contact points of the vibrator since this gives a much higher voltage at the ends of the secondary coil than where the coil is used without it; this is because: the self-induction of the primary coil makes the pressure of the current rise and when the contact points close the circuit again it discharges through the primary coil, and when the break takes place the current flows into the condenser instead of arcing across the contact points.
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. For the low voltage circuit, that is the battery circuit, use No. 12 or 14 insulated copper wire.
Then they all went down to the little dock where the Chelton was tied, and Cora, with a quickness born of long experience, ascertained that there was plenty of gasoline and oil in the craft. 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. But it was not safe to depend on it.
The instant it becomes magnetic it pulls the spring of the vibrator over to it and this breaks the circuit; when this takes place the current stops flowing through the primary coil; this causes the core to lose its magnetism when the vibrator spring flies back and again makes contact with the adjusting screw; then the cycle of operations is repeated.
The core, primary and secondary coils form a unit and these are set in a box or mounted on top of a hollow wooden base. 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 condenser is shunted across the vibrator, that is, one end of the condenser is connected with the spring and the other end of the condenser is connected with the adjusting screw standard. The ends of the secondary coil lead to two binding posts, which are usually placed on top of the spark coil and it is to these that the spark gap is connected. The Battery.
I at once attached the vibrator to the line and called up Heilbron. "Here Heilbron." "Here P. The English are in Lindley." "What!" "The English are in Lindley." "Impossible." "Please tell the President what I say." Silence. Presently the reply came "Here Postmaster-General. The President says impossible. Enemy still in Kroonstad." "Not much! Here they are, before my eyes.
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