In other circumstances this demand would have posed severe difficulties. However, they were living on the estate of the man who had introduced the manufacture of gunpowder to Britain, and provided King Charles II with many of his armaments. So Daniel went out and enlisted that man's son, young Charles Comstock, who in turn drafted a corps of servants and a few horses. They procured a field-piece from John Comstock's personal armoury and towed it out into the middle of a pasture. Meanwhile, Mr. Hooke had caused a certain servant, who had long been afflicted with deafness, to be brought out from the town. Hooke bade the servant stand in the same pasture, only a fathom away from the muzzle of the cannon (but off to one side!). Charles Comstock (who knew how to do such things) charged the cannon with some of his father's finest powder, shoved a longish fuse down the touch-hole, lit it, and ran away. The result was a sudden immense compression of the air, which Hooke had hoped would penetrate the servant's skull and knock away whatever hidden obstructions had caused him to become deaf. Quite a few window-panes in John Comstock's manor house were blown out of their frames, amply demonstrating the soundness of the underlying idea. But it didn't cure the servant's deafness.