Causing liquid to flow from the uprights of a loom was described in Antoninus Liberalis's Metapmorphoses, a second-century C.E. play. Guillemin, in his Illustrated History of White Magic, pp. 15 & 90, ascribes the method to a hidden sponge or a bladder in the sleeve. This rather obvious method was either adapted or reinvented to make a coin weep.