Electrode assembly for determining the identification of metals and metal alloys

摘要

An improved electrode assembly for determining the identification of metals and metal alloys having a test probe and a memory voltage indicator circuit for registering the potential difference (voltage) between the test probe and the metal to be identified. The test probe is made of a durable body having a pair of chambers therein for containing a saturated water solution of potassium chloride. A thin-walled tube is located within one of the chambers and contains therein a conductive wire and a saturated liquid mercury solution of granular calomel and potassium chloride. The voltage indicator circuit is electrically connected between the conductive wire and the metal to be identified. Utilizing the two chamber construction of the test probe substantially eliminates gas lock within the test probe and thereby allows extremely reliable and accurate readings of potential difference between the test probe and metal. These voltage readings are an indication of the characteristic properties of the metal to be identified.