The design of recording heads for use on a magnetic storage drum, and the characteristics of various recording surfaces

Short notes on the mechanical arrangements of various storage drums, and the principles of storing and recovering digital information from such drums, are followed by a discussion on transducer design. An optimum transducer design is described, which is suitable for both writing-and reading-head functions. The characteristics of Mumetal and ferrite transducers are discussed, as well as the problems of mounting and screening. The preparation and performance of both nickel-plated and oxide-coated recording surfaces are described, and the results are compared, showing that oxide surfaces are more suitable when high-density storage is required.