A english octoganal bloodletting instrument (scarificator) with 12 blades, c. 1850. The blade depth is adjusted by turning the large thumbscrew on top, and it is cocked by pulling back the large lever. A pushbutton trigger to fire the blade is to the side of the scarificator. This scarificator is in a good condition and has no damage on the 12 original steelblades. 4.5 x 5cm.