Patent for a new and improved ice machine. This design consists in "[a]n oil-trap for compression ice-machines, consisting of cylinders provided with inclined diaphragms, and having extensions provided with water-chambers and pipes extending down through the same" (lines 96-100). Said pipes are "to communicate with the cylinders, one of said pipes communicating with the extension of one of the cylinders and the other pipe leading from the ammonia-pump, said cylinders having a suitable arrangement of pipes and valves" (lines 1-6).