It was therefore now the main question to judge, whether the power of the air-gun was great enough to drive the ball forward into the brain. For this purpose I sent to the owner of the gun, in order to obtain a statement of the charge usually employed. But as he could not give me the information I desired, I tried the same gun myself. We shot against a deal door at a distance of 4 paces. The usual lead ball, which had a diameter of somewhat more than three lines, was thrown back by the soft wood, and only left a superficial mark. By this trial I was convinced that the ball had not force enough to pass twice through the membranes of the eyeball and also to penetrate through the contents of the orbit and its bones.
140 Years Ago . . .. Arch Ophthalmol. 2009;127(5):680. doi:10.1001/archophthalmol.2009.81