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That's because they're not made from slate, they're actually made out of Brunstone, the dark veins are from stacker boards between the slates to allow air flow while they dry out after milling them. If you take a real close look at them you won't see any circular machine grinding marks on the surface like you do on slate. They're also not pin & dowel in the seams. This model table is one of the cheapest models Brunswick offered at the time for those that just couldn't afford to buy a well built Brunswick table.when the boards are used to keep the prices apart are used, the drying/shrinkage is less effective under the boards, which leaves those areas slightly higher the rest of the surface. Block sanding is the only way to take down that area and blend it with the rest of the surface.
Well Glen,
That makes scene, but researching earlier posts, you stated that after the war, they started using Brunstone.
I found a link to the patents, and found that Brunswick patented it in early 1980's.
Found another off site thread that stated:
"Brunswick tried to market a synthetic bed on their tables two times I know of, calling it Brunstone and Bluestone. Common on early Gold Crown commercial tables of the 1960s and still around in the 1970s, these were the best non-slate beds ever made (although a little brittle). They subsequently discontinued use and production and now use only slate I believe."
This table, being at the bottom of the line, as you say "cheep" was described to have 1 1/8" slate.
I know what sandstone looks like, I cannot see any grain or sparkle, the corners that i repaired were layered like slate would chip or oyster.
There might have been a topping applied, but it is layered in the picture above, like slate.
1909 /1910, did the thought of Brunstone exist?
WH