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<p>The ordinary hermetically sealed Clark cell is subject to two types of failure: the cracking of the glass near the amalgam, and the interruption of the circuit by the gradual formation of gas in the amalgam limb. The cracking of the glass has long been known to be due to the alloying of the amalgam with the Pt wire and a resultant increase in the diam. of the wire. The trouble may be largely overcome by employing platinum wire which has previously been subjected for a short time to the action of hot 10% zinc amalgam, using a lead sealing-in glass. It seems likely that the difficulty can also be remedied by the employment of vessels made entirely of Jena 397/sup III/ glass, or by using this glass as a sealing-in glass. The formation of hydrogen gas%
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