Diagram, 'Curve representing the effect on the rate of variation of KClO3' by W H Pendlebury and Margaret Seward A diagram showing a series of curves relating to the results of Pendlebury and Seward's investigations into the interaction of hydrogen chloride and chlorate in presence of potassium iodide. A note to the printer explains that 'each curve represents a certain quantity of HCl present'. Subject: Chemistry A print of this diagram was published in volume 45 of the Proceedings of the Royal Society alongside the paper 'An investigation of a case of gradual chemical change: the interaction of hydrogen chloride and chlorate in presence of potassium iodide'. 1888