My guess would be that the top switch blade is a bimetallic strip and when current flows through the wire coil it heats up and opens the connection. Something like that probably.

#4 2 years ago

JJG

jgreene

Pinside member

11y 53,550 824 9

It looks like a bi metal strip. Is it in the bat coil circuit? I’d assume based on the name it’s there to open the circuit and prevent the coil from being energized too long and burning the coil.

#5 2 years ago

DMH

dhutton

Pinside+ Frequent

Exton, PA

9y 43,900 259 3

Anybody else wondering if that white patch it's mounted on is asbestos?

#6 2 years ago

SMM

dr_nybble

Pinside+ Frequent

Ottawa, ON

10y 114K 3,543 15

I’d say it is — I looked at it with a magnifying glass.

My grandfather was a rock collector, we used to have a big hunk of asbestos in the house.

#7 2 years ago

DNO

TwinDavid

Pinside+ Frequent

Newark, DE

4y 59,900 281 22

I don't think it's asbestos. It's more likely to be a ceramic compound made of aluminum oxide...similar to a spark plug. This would prevent the heat transferring to the wiring and creating a fire hazard.

#8 2 years ago

SMM

dr_nybble

Pinside+ Frequent

Ottawa, ON

10y 114K 3,543 15

Might have asbestos in it? It looks a bit furry. I could believe ceramic though, it sort of looks like cement on its edge.

#9 2 years ago

WFC

Billc479

Pinside+ Frequent

Pleasant Plains, IL

9y 79,800 3,139 15

Even if it is asbestos, or contains asbestos, as long as you don't mess with it - scraping it, etc., to release fibers in the air, you should be OK. It does not look friable.

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