Screen cover for manhole workers — Adapting manhole to new street grade Notes on underground conduit construction — Thawing water-pipes with electricity — Thawing water-pipes without a transformer — Thawing a frozen pipe by electricity — Methods of soldering wires in terminal lugs Soldered wire connections — Soldering with blow torch and iron — Test — board proof against crosses or shorts-protecting gas pipes against electrolysis A handy portable rheostat.