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How this transistor works in this circiut?

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Sparky_s

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While learning about transistors, I've found this circuit. After trying to understand how it works, I've no idea.
Basically, the circuit works using the collapsing magnetic field of a bifilar toroid.
As I understand, transistor works permitting to flow the electricity from collector to emitter, while applying a positive voltage to the base.
Basically I'm used to see an oscillator (like a 555), sending the on/off signal to the base of the collector.

In this circuit I cannot understand how the on/off signal is created. Maybe combining the resistor and capacitor to create a RC charge/discharge?
All information is welcome, because I don't understand anything.

**broken link removed**

**broken link removed**
 
Thanks for all the answers.
Maybe is similar like this circuit?
**broken link removed**

The main question is how the base of the transistor is switched on and off.

As far I know, I think the pulses are being sent into the base of the transistor by the RC combination. Without the 555 IC, anyone can send pulses with this simple circuit?
 
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