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As the cathode-ray oscillograph is becoming more widely used in laboratories, the specific requirements for its application to particular problems become important. This paper discusses the relation of these requirements to the design of a complete cathode-ray oscillograph. The deflection-amplifier design is discussed with respect to the electrical and mechanical design of the equipment. Linear sweep-circuit design, the application of grid modulation to transient studies, frequency determinations, and return-trace elimination are discussed. With regard to the power supply, voltage considerations, ripple elimination, brilliance, amplifier and control-circuit requirements, are considered especially as to their effect upon transformer and filter design. Physical requirements of the layout of equipment for a commercial unit are examined according to the design considerations covered in the paper.