| http://www.w3.org/ns/prov#value | - Instead of employing an annular electrode as in the two forms of apparatus previously described, which is adapted to surround pipe sections or equivalent work-pieces, the reverse arrangement illustrated in transverse section in Fig. 4 may be utilized, in which electrode I5 is formed to face outwardly and is of the proper diameter to fit within the pipe section P with the proper intervening arcing
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