Im renovating an old dairy barn and have found 2 of these. 1 was hanging in the old milking stancheons, the other is by the door. Both have glass globes that seem to be filled with a liquid. There don't appear to be any electrical components.
Im renovating an old dairy barn and have found 2 of these. 1 was hanging in the old milking stancheons, the other is by the door. Both have glass globes that seem to be filled with a liquid. There don't appear to be any electrical components.