Despite being an aficianado for more than 50 years, until today I'd never heard of a "Jones can". I presume this is what is called a "douche can" in British nursing textbooks, and a "bock" in French.
European douche cans often have an outlet at the bottom, centrally located. The spout is thus L-shaped, tho' older ones were simply a straight glass nozzle from which the rubber tube hung vertically. To stop this spout getting damaged, for they were mostly of glass, the base was surrounded by a tin wall, with a half-moon cutout so the rubber tubing was not nipped when the can was placed on a table.
Other holders for the glass were of enamel, usually white, but sometimes pink, blue or even a floral design.
Modern European cans are of plastic - polythene or polypropylene usually, tho' in France this type of plastic is often incorrectly called "nylon".
An alternative design for British, French and German enamel douche cans had the spout, not at the center of the base, but on the side. This had the advantage of a larger can size, and with the flat base could be stood up on a table or desk.
The main disadvantage that there was always a quarter of an inch of fluid left in the can at the end of the administration, so the unwary could get an unexpected wetting.
French, German and British douche can design varied too in the presence or absence of a handle, and in the method of support if hung from a hook.
In the 1960s The standard British enamel can, prone to unsightly chipping was replaced with stainless steel.