Alternating current bridge methods for the measurement of inductance, capacitance and effective resistance at low and telephonic frequencies. A theoretical and practical handbook for the use of advanced students: by B. Hague, D.Sc. (Lond.), lecturer in electrical engineering in the University of Glasgow, second edition, revised and enlarged. xvi–391 pages, diagrams, 8vo. New York, Isaac Pitman & Sons. Price $4.50