This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
It consists of a pair of flanged iron pieces with screw points which are screwed into opposite sides of the carboy, one inch above the middle point. The carboy is then lifted into the trunnion and thus suspended a few inches from the floor. In this position it is readily tilted and emptied of its contents, but resumes an upright position as soon as the hand is removed. The stand consists of cast-iron supports, connected by a wrought-iron pipe and rod.
Fig. 45. - The Trunnion.
Manufactured by the firm of John Matthews in New York. Drop the ring over the neck of the carboy, also the soft rubber packing; place upon the rubber packing the porcelain cup; pass through the centre perforation of the cup, to the necessary depth, the glass tube. An attached rubber ring or packing makes it rest snugly in its seat in the cup; put the iron strap over the tube and down upon the cup, so that the bolts in the ring shall pass through the bolt holes in the lugs of the strap; adjust the thumb-screws to the bolt, and lastly screw them down until the whole instrument is firmly drawn together; attach the pump to the top of the box of the carboy by means of the gimletpointed screw fastened to the bottom of the pump, which may be done without the use of tools; then connect the pump with the stone cup by-means of the flexible rubber tube, slipping one end upon the nozzle of the pump into the side perforation of the cup. Wetting the inside edge of the rubber packing facilitates springing it upon the neck of the carboy. The moving parts of the pump should be kept well oiled. The last portion of the contents of the carboy should be drawn into a vessel tall enough to receive the mouth of the glass tube into its neck, such as a six-pound wide-mouthed bottle, in order to protect the operator against the momentary slight sputter which takes place when the carboy is empty. This sputter is caused by the compressed air inside, establishing a current through the glass tube, and carrying with it particles of acid therefrom. The current may be checked at once, however, by pulling the flexible rubber tube from the perforation in the porcelain cup, which vent permits the air to escape without any moisture. (Chester's Carbonated Beverages.)
Fig. 46. -Acid Dispenser.