Abstract: A two-stage apparatus for measuring quantities of constituents of a product for canning includes a quantity measuring chamber which is substantially vertical and mounted on a support which rotates about an axis. The chamber comprises a tubular enclosure inside which slides a first piston. A lower part of the chamber is connected by supply conduits to a respective one of a pair of tanks, each of which is for holding a different one of the constituent products. The chamber is also connected by a delivery conduit to a filling nozzle, in which slides a secondary piston. A control valve selectively opens and closes the passages through the supply conduits to the measuring chamber in a predetermined order, and for a predetermined period of time to thereby control the relative quantities of the constituents supplied to the chamber. The control valve is adjustable to vary the ratios of constituents introduced into the chamber.