coulometer
voltameter

It is cheaper than the silver voltameter, but slightly less accurate.

The electrochemical equivalent of an element is measured with a voltameter.

The Hofmann voltameter is often used as a small-scale electrolytic cell.

With George Wood Vinal he made an amperemeter based on a silver voltameter.

Samuel Thomas von Sömmerring invents a water voltameter electrical telegraph.

Next, from a zippered pocket, he withdrew a wallet-size device-an extremely sophisticated variation of a voltameter.

This kind of voltameter is sometimes called Hofmann voltameter.

Faraday used an apparatus that he termed a "volta-electrometer", subsequently Daniell called this a "voltameter".

The name 'voltameter' was coined by Daniell who shortened Faraday's original name of "volta-electrometer".

The voltameter is an electrolytic cell and the measurement is made by weighing the element deposited or released at the cathode in a specified time.

August von Hofmann proposes the now standard system of hydrocarbon nomenclature and invents the Hofmann voltameter.

(A Hofmann voltameter cannot be used to weigh electric current in this fashion, as the platinum electrodes are too inert for plating.)

The Hofmann voltameter is an apparatus for electrolyzing water, invented by August Wilhelm von Hofmann.

When current is run through Hofmann's Voltameter, gaseous oxygen forms at the anode and gaseous hydrogen at the cathode.

This is similar to the silver voltameter but the anode and cathode are copper and the solution is copper sulfate, acidified with sulfuric acid.

The volumetric composition of water is the ratio by volume of hydrogen to oxygen present This value is 2:1 experimentally,this value is determined using Hofmann's water voltameter.

A Hofmann voltameter is often used as a demonstration of stoichiometric principles, as the two-to-one ratio of the volumes of hydrogen and oxygen gas produced by the apparatus illustrates the chemical formula of water, HO.

However, before the invention of the ammeter, voltameters were often used to measure direct current, since current through a voltameter with iron or copper electrodes electroplates the cathode with an amount of metal from the anode directly proportional to the total coulombs of charge transferred (Faraday's law of electrolysis).