Here is a diagram, and no I didn't go to art school lol. As shown, the switches will either feed the light a hot and a neutral, 2 hots, or two neutrals. The safety issue is that in one position the screw shell of the light fixture is hot instead of the tab. If the circuits are on 2 different phases then the 2 hots will feed it 240 volt and burn out the bulb. The 2 neutrals will play he11 with arc fault breakers. This is a very common style of wiring in my area for houses wired with knob and tube, usually 1920's vintage through the 40's. Hope it helps
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for �200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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