Three Methods of Attaching an Earth Lead to a Water-pipe.—Left and Centre: Two types of earth clips. Right: A plumber's joint. It is essential in all cases to see that the pipe is sand-papered clean and bright before making the connection.
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Radio Record, Volume VI, Issue 51, 30 June 1933, Page 25
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41Three Methods of Attaching an Earth Lead to a Water-pipe.—Left and Centre: Two types of earth clips. Right: A plumber's joint. It is essential in all cases to see that the pipe is sand-papered clean and bright before making the connection. Radio Record, Volume VI, Issue 51, 30 June 1933, Page 25
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