Okay. I was just going by what 99.9% of the world's population would consider a blackboard.
Even looking for "blackboard font" in Google only leads you to various fonts which look like they were hand written on a chalkboard. Much like the one I linked to above.
What you want is referred to as an outline font. I know I have the font you linked to on Wikipedia, and quite a few others much like it, but I don't have the time to dig and see which ones they are right now.
However, a quick look an Adobe's site shows that Monotype Old Style Outline Bold is close to what you're looking for. Main search page if you want to look for others.