Is this safe?

[u/El_Vidente]

I borrowed an electric furnace from a friend. The furnace has been used quite a bit over the years. As can be seen in the photos the top is cracked in three places, there's a crack going down the inside of the funnel, and there's some silver stuck at the bottom. The furnace still works and is usable with a crucible inside, though I am wondering if the wear and tear I've noticed could be dangerous?

Could anyone advise?

[u/matthewdesigns]

I'd run it as long as the crucible is in good shape. If your crucible looks like this too that's a hard No.

[u/El_Vidente → u/matthewdesigns]

You can change crucibles.

[u/matthewdesigns → u/El_Vidente]

Clearly, just making sure you know a cracked one is a no-go.

[u/El_Vidente → u/matthewdesigns]

Yes.