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As promised, here are some photos of the set I have. Perhaps you can't see from the angle, but the numbered dial spins to raise/lower the holder in the center, and (it's missing a piece, but) there...

Microtomes were designed to be used with a base piece. It had a screw type adjuster that allowed you to raise your sample by a very small amount above a flat table, so that when you slid the flat...