Feeding bottles of this shape were on sale from 1900 for about 40 years. The Allenbury feeder devised by Allen & Hanburys, U.K. was the first of this type. They were easier to clean and the mild flow was easier to regulate. Mellin's was a company which produced patent milk solids and cereal preparations from c1860s. ("The Antiques and History of Childhood" Sally Kevill-Davies.)
Glass feeding bottle. Bottle is loosely boat shaped with flat base, and neck and openings at either end. There is a small flattened area on the base to allow the bottle to balance. Graduated markings for months of age and tablespoons. Visible join seams on bottle.