Diagrams, experimental equipment by Edgar Philip Perman Three diagrams labelled 'Apparatus used for determining the vapour-density of bromine (section)', 'Forms of apparatus used for iodine and aqueous hydrochloric acid (section)' and 'Vapour-density of iodine from determinations of the velocity of sound by Kundt's method (section of apparatus used)' respectively. Includes notes to the engraver. Subject: Chemistry Prints of these diagrams were published in volume 48 of the Proceedings of the Royal Society alongside the paper 'Experiments on vapour-density'. 1890