Sounds plausible. I sometimes make glass capillaries in a similar way for injecting very small amounts into very small spaces.Oh yeah? Huh. Now I'm doubting my memory. I seem to remember like... snapping a piece of glass, and there'd be this edge, like the tail of an exponentially increasing plot say, and that edge would be really sharp and you'd put it into a clamp yoke, and use it to do your slices...
Hm. I'm having trouble believing I'd make something this involved up... yet I'm not sure exactly when I'd have done anything like this. Maybe 4th year undergrad? No idea.