Burette: Glass Tube Drawn Down, Graduated by Weighed Water and Etched (Barrett, 1892)

A burette is a graduated tube for delivering known quantities of a liquid. W. F. Barrett (1892) makes one from a glass tube about 1 to 1.5 cm wide: draw one end down in the blow-pipe flame, close it with rubber tubing and a glass-rod plug, then mark it by pouring in 10 grammes of water at a time, divide each space into ten on a dividing engine, and etch the marks. The etching uses hydrofluoric acid, which is poisonous on skin contact: this blueprint is gated. Source: W. F. Barrett, Practical Physics (1892), Experiment 18, pp. 47-48 (etching: Experiment 7). Picture: p. 47.