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on corresponding exposures-of unrodded buildings, and that properly installed and well-maintained rods have shown an efficiency in the prevention of lightning damage of well nigh IOO per cent.
"A substantial metal roof with all parts thereof in good electric contact can, according to available evidence, be utilized as a part of the lightning-protection system for a building and thus in part be made to serve a double purpose. The cost of grounding and making other necessary electrical contacts with interior masses of metal is relatively small.
" The cost of lightning protection is more than justified when the added personal safety and avoidance of temporary deprivations, as well as the saving of property, are considered.
" The committee calls attention to a 'Safety code for protection of persons and buildings against lightning,' prepared by a committee working under the direction of the American Engineering Standards Committee.
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