The Pulvermacher chain, or in full as it was sold the Pulvermacher hydro-electric chain, was a type of voltaic battery sold in the second half of the 19th century for medical applications.  Its chief market was amongst the numerous quack practitioners who were taking advantage of the popularity of the relatively new treatment of electrotherapy, or "electrification" as it was then known.  Its unique selling point was its construction of numerous linked cells, rendering it mechanically flexible.  A variant intended to be worn wrapped on parts of the body for long periods was known as Pulvermacher's galvanic chain or electric belt.
The Pulvermacher Company attracted a great deal of antagonism from the medical community due to their use of the names of well-known physicians in their advertising without permission.  The nature of their business; in selling to charlatans and promoting quack practices also made them unpopular with the medical community.  Despite this, the Pulvermacher chain was widely reported as a useful source of electricity for medical and scientific purposes, even amongst the most vocal critics of the Pulvermacher Company.