Model T Coil Electric Fence

I bought one of those coils without the case at an estate sale and didn't know till now what it was. Thanks.
 
The adjustment of the ball ramp (glass tube) up or down changes the zap rate on the fence line. I think the higher the angle the faster the shock rate on the fence. Folks did all sorts of things with model T coils back in the day. More modern fence chargers had a bi-metallic switch to set the rate. A lot of them still used a 6-volt lantern battery back when I was a kid.
 
Dad had a fencer that had a sealed glass tube with a bit of mercury inside. The tube slowly oscillated side to side so the mercury blob rolled from one end to the other. There were electrodes in each end of the tube so the blob completed the circuit briefly as it rolled back and forth. Of course, this was at a time we played with mercury in science class.
 
As a young lad in mid 50's, we had a neighbor that collected out freebies and baseballs. We got even on day with a T coil and telephone battery. Wired it to his outside door hardware and rung the door bell. Big trouble for us. But worth it
 
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