Elementary Mechanical Drawing Theory And Practice

Cover Elementary Mechanical Drawing Theory And Practice

ELEMENTARY MECHANICAL DRAWINGCHAPTER I INSTRUMENTS AND MATERIALS 1. Introductory.The instruments used in mechanical drawing may be divided into two distinct groups: first, the set of instruments, generally in a case, consisting of a compass, dividers, ruling pens, etc., and second, the drawing board, T-square, triangles, etc. To secure good results in mechanical drawing good instruments are necessary. Economy in the purchase of instruments is unwise, because drawings made with inferior instrumen

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ts will be of inferior quality in technique. A good set of instruments with proper care will serve the student's needs almost indefinitely. The instruments of the second group, such as the drawing-board, etc., may, however, be of medium grade, if the cost of the very best is prohibitive.The materials used may also be divided into two parts: first, such materials as drawing-paper, tracing-paper, tracing-cloth, and printing-paper; and second, pencils, erasers, inks, etc. The drawing-paper mTable of Contents CONTENTS; Pagi; Preface ^; Introduction' u; CHAPTER I; Instruments and Materials; List of Instruments; Paper and Tracing Clotli L; List of Supplementary Instruments 13; CHAPTER II; The Use op Instruments 20; Scale 20; Protractor 2; Triangles or Set-squares 2; Lead Pencils 2:; Ruling Pen 2!; Compass 3; Dividers 3:; Irregular Curves 3; CHAPTER III; Method of Procedure in Drawing 3; CHAPTER IV; Lettering 4; CHAPTER V; Drawing Room Practice and Conventions 4; Definitions of Drawings 4; Alphabet of Lines 5; Dimensioning 54; Cross-hatching or Cross-sectioning 57; Sections 5; Shade Lines &'; Line Shading (j*; CHAPTER VI; Projections 7; Definitions 7; Perspective Projection

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