On the left is a porcelain Bunsen burner for use in corrosive atmospheres. Second from the left is an 1872 Bunsen burner topped by a 'rose', as introduced in the 1860s. Second from the right is an Argand gas burner, made by Towson and Mercer. On the far right is a standard Bunsen burner. The well-known burner was developed from the older Argand burner by the German chemist Robert Wilhelm Bunsen (1811-1899), his technician Peter Desaga and his English student Henry Enfield Roscoe. The Bunsen burner has an adjustable air valve at the base of the tube, which can be opened to varying degrees to alter the intensity of the flame.
© Science Museum / Science & Society Picture Library