Horace Gray

“ A is the main body of my percolator. B is a constricted inlet. C is the enlarged open end, which serves the double purpose of a discharge or outlet, and as an opening through which the percolator is charged with filtering substance when the device is to be used as a filter, or with any drug from which an extract is to be made. ”

“ The percolator is a cylinder wholly open at the lower end, and with a cover at the upper end, having a small opening, attached to which is a flexible or adjustable tube leading from a reservoir of the liquid to be used for steeping the drug. The percolator is turned bottom up while the drug is put in, and a perforated or porous diaphragm inserted, to hold the drug in place. ”

“ But, passing over the difficulty that the diaphragm is not claimed as part of the combination patented, neither the percolator open at one end, the diaphragm, the inversion of the percolator, the insertion of the tube in the small opening in the covered end, nor the making that tube flexible, and with a stopcock, is new. ”