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Philadelphia, The Council, A new edition of a standard work is always a welcome occurrence and this seventh edition of a directory of libraries in the Philadelphia area is no less so. The material contained in this directory will serve several uses.
It gives in the alphabetical list the location of a particular library and hours when it is open. Further data are the conditions under which the library may be used and what facilities it has for making its material available by reproduction, photostat or microfilm.
However, the greatest value of the directory is for those seeking information on the subject resources of Philadelphia libraries. Each entry includes information on the major subjects covered in the library's collection and any special collections it may own.
A subject index provides a ready key to this material. For example forty-three libraries are listed under the heading chemistry and others under chemical engineering, chemicals, chemistry-medical and pharmaceutical, and chemistry, physical. More specialized subjects such as catalysis, sugar, jet propulsion engines, linoleum might be mentioned as indicative of the range of technical interest of Philadelphia libraries.
A personnel index includes the names of the leading staff members of the libraries listed, in addition to serving as a membership list of the Special Libraries Council of Philadelphia and Vicinity. Merrill and Walter H. James; sixth edition revised by Venton Levy Doughtie. This is the sixth edition of the book, the first having been brought out in It incorporates revisions, rewriting, new illustrative examples and new problems for exercise.
The student is introduced to the work by a series of definitions following which motioh and vectors are discussed. The methods for obtaining velocities are then described, emphasizing coplanar motion, and involving resolution and composition, instantaneous axis of velocity, centro, and relative velocity or velocity polygon. This precedes acceleration analysis, developing the relative acceleration method.
Subsequent chapters deal with linkages which describe the four bar linkage used in mechanism analysis and the transmission of motion by direct contact where the bodies constituting the driver and follower are in pure rolling contact or sliding between surfaces in connection with friction drives, gears, cams and screws. A later chapter is devoted to belts, ropes and chains, and finally a treatment is given to miscellaneous mechanisms such as hoisting tackle, parallel motion by cords, inclined plane and wedge, screws and screw threads.
The author believes in exercise to impress the subject matter. There are many problems at the end of chapters. In the back there are laboratory problems t h a t may be worked on 18 X 24 in. Problems are stated in words, no sketches provided, and are arranged according to subject headings.
The average time required to work each problem is given. A subject index completes the work. The book provides a rigorous treatment using both graphical and algebraic methods, and employing the simpler methods of calculus which may be omitted without destroying the continuity of the work. Weber, Marsh W. White and Kenneth V.
First edition. The science of physics which provides the tools for the chemist, geologist, engineer amt astronomer has also originated the scientific method about which much is heard today. The principal aspects of the scientific method are selective analysis, accurate measurement and mathematical treatment. Fields of knowledge other than physics, by common consent, arc considered scientific to just the extent t h a t their ideas are subject to these aspects.
The study of physics, to be inclusive of this recognized valuable element, must be thorough from the very fundamentals and adapted to the prerequisites of the student. Clarity and complete understanding in each of the aspects are necessary. The authors of this book bring forth in the preface t h a t its purpose is to help in the acquisition of basic physical principles and to apply them in the solution of technical problems by the scientific method.
It is suited to college level students. The general topics covered in order are mechanics, heat, sound, electricity and magnetism, and light. A considerable portion is devoted to the first of these much of which is required in orienting the student to the new situation including a description of the fields and uses of physics, and vectorial representation.
Near the end of this and in preparation for the study of heat, an exposition of the molecular theory of matter is given. The treatment on heat itself has a short coverage in a number of pages, b u examination reveals it is one of the best presented in the book, especially with its illustrations and application of formulas to solve pertinent problems. The following subject of sound is to some extent in this class also.
Magnetism and electricity covers the largest part of the book and includes electrical instruments and measurements, chemical effects of electric current, induction, capacitance, alternating currents aml electronics.
The last subject, light, covers reflection, refraction, color, optical instruments, diffraction, and polarized light. A final chapter entitled "Twentieth C e n t u r y Physics" selects certain important additions to our knowledge since the year and explains their application to devices and techniques t h a t have brought forth improved contributions to current civilization and revolutionized warfare.
The presentation is a logical sequence of well connected topics. The restriction of the use of mathematics to algebra and trigonometry brings the usefulness of the book within a much broader circle, even though the coverage of the contents is restricted in proportion. The outstanding feature of the book is clarity coupled with a continued inspiration.
A serious minded student should be able to follow the text, to solve the illustrative problems, and work out answers to the questions and problems at the end of chapters with a minimum of outside help.
The preparatory paragraphs in each chapter, the photographs of outstanding physicists with brief references to their contributions a t the beginning of chapters, and such chapters as the Use of Physics and Twentieth Century Physics furnish color to the study.
Boston, American Photographic Publishing Co. The author presents this book with suggestions for the photographer in all types of photography. Throughout the work many ideas are given to correct errors and improve methods.
Elements of Mechanism
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Elements of mechanism