Twin-Cylinder Tube-Link Churn: Two Churns Pumped Into Each Other Through a Tube

Fisher knew double dasher churns already existed, so he claimed only what joined his two. Daniel Fisher of College Corner, Ohio, received US 7,870, dated 1 January 1851, for "connecting two vertical churns by a horizontal tube at their bottoms ... (said tube being about ten inches long, and about one fifth of the capacity of one of the vertical cylinders) in combination with the perforated cutters E E." A lever on an upright between the cylinders works perforated plungers on two rods; the cream is "alternately forced through the openings in the segmental slides E and those in the pistons." This rung checks the tube's proportion, then prints the tube, slides and plungers, joins two pots, and makes butter.