PRACTICAL MATHEMATICS PRACTICAL MATHEMATICS INCLUDING - TRIGONOMETRY AND AN INTRODUCTION TO THE CALCULUS A Class-Rook for Higher Elementary Secondary and Technical Schools BY A. H. BELL, B. Sc. Hailing Scholar of Oivens Col cge, Manchester Director and Secretary for Higher Education, Sheer ness BLACKIE AND SON LIMITED 50 OLD BAILEY LONDON GLASGOW AND BOMBAY 1919 PREFACE So many text-books on Algebra have appeared during the last few years that the publication of yet another requires some justification. In the present volume, the processes of Algebra are established in a practical way, and their application to Science and Mensura tion is made a prominent feature Although some boys find a certain satisfaction in juggling with meaningless symbols, the application of Algebra to practical problems rouses their interest and fills them with enthusiasm. The author finds encouragement in a recent address to the Mathematical Association by Professor Whitehead, F. R. S., which contained the...