https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13991660
An anxious patient checking with his dentist that that if he has gas anesthesia he will not be robbed of his money. Wood engraving after L. Raven-Hill, 1908.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use