How would I be able to tell which oil derricks use the bi-metal strip vs the smoother operation I've seen ? Lionel or MTH, it doesn't matter.
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Oil derricks that run continually do not use the bi-metal strip. I use both kind on my layout. For some reason the ones with the bi-metal strip bubble better . Both use the same type of bulb.
Mike, I wonder if the vibration from the pumping action on the Bi-metal strip models helps to get the bubbles to form ?
I had the re-issued version in the '80s. The noise used to get on my nerves a bit. That's why I'm considering the newer ones with the can motor.
There might be a fine point 3rd option, at least a few modern (like 1990's era)units used a 555 timer chip on a circuit board.
The operation visually was probably identical to the strip versions though, just electronically controlled pulses rather than the strip heating and cooling down.
-Dave
