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This series contains correspondence, memoranda, reports and minutes concerning the design and construction of power stations and substations including details of costs, equipment, repairs and maintenance, current supplies and complaints regarding the emission of grit and fumes. Also includes details of the Kearny Station, New Jersey and the power station of the Ohio River Edison Company.

This series contains correspondence, memoranda and extracts from minutes concerning current supplies for railways, modifications to Lots Road Power Station, the construction and improvement of substations, the installation of apparatus and electrical interference with broadcasting.