Question

Before oscillator what are used to produce oscillations

Answer 1

Answer:

a thread

Explanation:

because there were no thought of using strings. That's only available on that time.

Answer 2

Answer:

The Colpitts oscillator uses a capacitive voltage divider network as its feedback source. ... Then C1, C2 and L form the tuned tank circuit with the condition for oscillations being: XC1 + XC2 = XL, the same as for the Hartley oscillator circuit