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Report No. 290. Water-pressure distribution on a seaplane float
722
Book
REVIEWS.
[J. F. I.
need of storage batteries in that service may be said to have been eliminated. To a restricted extent its use in that service survives, but in greater part, the industry has grown in meeting the demands of other applications, some of which are familiar to everyone, as for example, to the starting and lighting system of motor cars, electrically-propelled trucks and the now widely used electric lighting of steam railway cars, and many other equally important auxiliary functions. The technique of storage battery engineering is of highly specialized character, and in order to successfully cope with its problems, a keen appreciation not alone of the electrochemical features of the subject but also of its constructive features is requisite. It is upon a practically useful plan of this sort that the present treatise is designed. First the general theory is taken up, then lead plates, factors influencing capacity and efficiency, the lead storage cell, its component parts and assembly, installation, operation and maintenance. This is followed by considerable space on the Edison nickle-iron-alkaline cell, and finally chapters on storage battery testing and on storage battery applications. The subject-matter throughout is adequately illustrated by half-tones and many illuminating diagrams of characteristics and performance. The inclusion of many practical details of manufacture, as precautions to be observed in lead-burning and types of construction are notable features. The work is thorough and exceedingly consistent in the treatment of its diversified contents. LUCIEN g. PICOLET. NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS. Report No. 29o. Water-Pressure Distribution on a Seaplane Float, by F. L. Thompson. 15 pages, illustrations, plate, quarto. Washington, Government Printing Office, I928. Price, ten cents. The investigation reported herein was conducted by the Committee at the request of the Bureau of Aeronautics, Navy Department, for the purpose of determining the distribution and magnitude of water pressures likely to be experienced on seaplane hulls in service. It consisted of the development and construction of apparatus for recording water pressures lasting one one-hundredth second or longer and of flight tests to determine the water pressures on a UO-I seaplane float under various conditions of taxying, taking off, and landing. The apparatus developed was found to operate with satisfactory accuracy and is suitable for flight tests on other seaplanes. The tests on the UO-I showed that maximum pressures of about 6. 5 pounds per square inch occur at the step for the full width of the float bottom. Proceeding forward from the step the maximum pressures decrease in magnitude uniformly toward the bow, and the region of highest pressures narrows toward the keel. Immediately abaft the step the maxinmm pressures are very small, but increase in magnitude toward the stern and there once reached a value of about 5 pounds per • quare inch.
Book
REVIEWS.
[J. F. I.
need of storage batteries in that service may be said to have been eliminated. To a restricted extent its use in that service survives, but in greater part, the industry has grown in meeting the demands of other applications, some of which are familiar to everyone, as for example, to the starting and lighting system of motor cars, electrically-propelled trucks and the now widely used electric lighting of steam railway cars, and many other equally important auxiliary functions. The technique of storage battery engineering is of highly specialized character, and in order to successfully cope with its problems, a keen appreciation not alone of the electrochemical features of the subject but also of its constructive features is requisite. It is upon a practically useful plan of this sort that the present treatise is designed. First the general theory is taken up, then lead plates, factors influencing capacity and efficiency, the lead storage cell, its component parts and assembly, installation, operation and maintenance. This is followed by considerable space on the Edison nickle-iron-alkaline cell, and finally chapters on storage battery testing and on storage battery applications. The subject-matter throughout is adequately illustrated by half-tones and many illuminating diagrams of characteristics and performance. The inclusion of many practical details of manufacture, as precautions to be observed in lead-burning and types of construction are notable features. The work is thorough and exceedingly consistent in the treatment of its diversified contents. LUCIEN g. PICOLET. NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS. Report No. 29o. Water-Pressure Distribution on a Seaplane Float, by F. L. Thompson. 15 pages, illustrations, plate, quarto. Washington, Government Printing Office, I928. Price, ten cents. The investigation reported herein was conducted by the Committee at the request of the Bureau of Aeronautics, Navy Department, for the purpose of determining the distribution and magnitude of water pressures likely to be experienced on seaplane hulls in service. It consisted of the development and construction of apparatus for recording water pressures lasting one one-hundredth second or longer and of flight tests to determine the water pressures on a UO-I seaplane float under various conditions of taxying, taking off, and landing. The apparatus developed was found to operate with satisfactory accuracy and is suitable for flight tests on other seaplanes. The tests on the UO-I showed that maximum pressures of about 6. 5 pounds per square inch occur at the step for the full width of the float bottom. Proceeding forward from the step the maximum pressures decrease in magnitude uniformly toward the bow, and the region of highest pressures narrows toward the keel. Immediately abaft the step the maxinmm pressures are very small, but increase in magnitude toward the stern and there once reached a value of about 5 pounds per • quare inch.