This book contains a comprehensive reference guide for common mathematical formulas used in drafting, Drafting, or technical drawing, is refers to the composing of drawings that visually illustrate how something functions or is constructed. From calculating horse power and centrifugal force to useful trigonometry, this volume will prove to be an invaluable resource for engineers, draftsmen, and anyone else with an interest in the formulas used in related fields. Contents include: "General Tables and Formulas", "Mathematical Signs", "Trigonometrical Functions", "Formulas for Right-Angled Triangles", "Oblique-Angled Triangles", "Formulas for Falling Bodies", "General Horse-Power Formula", "Formulas for Centrifugal Force", "Average Strength of Common Materials Other Than Metals", "Gearing", "Screw Threads", "Miscellaneous Tables", etc. Many vintage books such as this are increasingly scarce and expensive. It is with this in mind that we are republishing this volume now in an affordable, modern, high-quality edition complete with the original text and artwork.