Can anyone tell me what this is? I found it in an 1880's vintage home in Lambertville NJ. It was on a shelf in a second-floor closet. It is an all-metal container(approx. three gallon capacity). It has a glass sight gauge and spigot. A 1" diameter iron pipe comes out of the top and vents to the outside of the house. The same diameter pipe came out of the bottom and ran straight down to the basement. Whatever it was once connected to is no longer in the basement. I was going to remove it but was worried about doing damage to the brick exterior of the house. So now it just sits there in that closet mystifying everyone who looks at it. I'd sure like to know what its original purpose was.