Here's how I think this circuit works:
While the capacitor C6 is charging through Q1's base, the transistor is conductive; when the capacitor reach its fill of charge, current can no more flow from the base of the transistor Q1.
After Q1 is turned off, a momentary AC signal, which lasts for a fraction of a second, is induced in both capacitors C1, which is connected to the output, and C4, connected base of Q2. The signal from C1 goes right to the common output not, labeled Output, and that from C4 goes to the base of Q2, thus turning it on accordingly.
Q2 turns off, and the same process is repeated with C2 and C5.
Q3 turns on and off according to the signal from C5, and lastly, C3 dumps its output signal to common output.
This process can be made to repeat itself by means of the variable resistor R2, and hence the frequency can be controlled. the 100K resistor is there for the capacitor to discharge. the 1mF capacitors are intended to pass the AC signal with little, if no, impedance.
But my problem is with the 1µF cap, the 100K resistor, and the variable resistor placed between C6's negative and Q1's base.
Is my arrangement of those three afore mentioned components correct for the whole circuit to oscillate?