Topic: Glass battery jar lid?

[ian.macky]

Hi all.  I got a query from a detectorist who found an unusual glass article in an old brewery in the city of Frankenstein in Silesia, and wanted to know if I could ID it.  It looks like a glass battery jar lid to me, though you'd expect that the hole in the center of the lid would go through, but this one is blind, with a rubber plug, and a side-hole near the bottom.  It's embossed D.R.P. and "T i c" in logo-like lettering.  D.R.P. is the usual, but the "T i c" rings no bells.

Anyone?

[NevB]

Could it be from some sort of fermentation jar?

[chopin-liszt]

I agree absolutely that the T i c looks liks logo lettering - and the particularly large T also looks like an illustration of some tool or other bit of equipment. Could that be a clue or hint?
I'm sure architects use large wooden t blocks, it's the same shape as the massive cast iron tool you use to turn mains water off under the pavement outside your house.
It could even represent an electrode in a Leyden jar.

[ian.macky]

It looks a lot like a battery jar lid, but you'd expect the large central hole to go straight through-- so a large blind hole with a small side passage doesn't make much sense.

Yes, cast iron goods were made with a large wooden pattern, pressed into green sand-- one for each side-- then the pattern is removed and the two halfs fitted together and the metal is poured in.  I gave my mom a large pattern of a pipe joint many years ago...

I did a lot of searching trying to figure out the T i c meaning, but got nowhere.

When I passed NevB's suggestion of a fermentation jar back to the finder, he said someone at his end had the same idea.

So, I guess we'll have to leave this open as an unidentified?

[chopin-liszt]

I'm puzzling over the rubber bung bit. Could it be just a means of lifting the lid up?

Could it be that while the indent is real, but somebody has just found a bung which fits the space, and bunged it in? (but then why the indent in the first place?)

[NevB]

I was thinking that the hole in the side and the bung are some sort of pressure release system?

[chopin-liszt]

I thought the bit around the bung was solid?   
Is that little, round, dark grey bit the red arrow is pointing at, in the bottom pic, a hole in that section that the bung would seal?

[NevB]

I think so, ian.macky says there is a hole there.

[ian.macky]

Here's a better view of the rather strange hole in the lid.

[chopin-liszt]

So, it could be used to release any gas that was produced under the lid by twisting or removing the bung?

How good a seal would the lid make with whatever jar was under it? Is there anything which suggests a rubber seal was around it?