Francesco Roncalli-Parolino
Italian who made a flexible catheter of spiral silver covered with silk about 1720
- Dates
- No dates given in the film's sources
- Chapters
- VI. The Stone-Cutters
What the film says
-
The unnamed Italian who made a flexible catheter much like Franklin's some thirty years before.
On the timeline
- About 1720: Francesco Roncalli-Parolino makes a flexible catheter of spiral silver covered with silk. timeline