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A meeting was held in the engineering rooms on May 14, C. R. Morey presiding, with an attendance of 13. Mr. Morey read a paper on “Lightning Protective Apparatus.” He discussed atmospheric conditions making lightning protection necessary. The effect of lightning discharge was pointed out and similar effects produced in switching were also shown. The theory of the lightning-arrester and its component parts was taken up together with their location to afford the most efficient protection. Mr. Morey described the more important types of arresters from the earliest forms to the most recent. The operation of each was fully explained. A few foreign types of arresters were discussed briefly. The multigap and electrolytic arresters were considered in detail. A short discussion followed the reading of this paper.