Mechanical Drawing, Self-Taught (Illustrated)
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Mechanical Drawing, Self-Taught (Illustrated) Overview
The object of this book is to enable the beginner to learn to make simple mechanical drawings without the aid of an instructor, and to create an interest in the subject by giving examples such as the machinist meets with in his every-day workshop practice. The plan of representing in many examples the pencil lines, and numbering the order in which they are marked, the author believes to possess great advantages for the learner, since it is the producing of the pencil lines that really proves the study, the inking in being merely a curtailed repetition of the pencilling. Similarly when the drawing of a piece, such, for example, as a fully developed screw thread, is shown fully developed from end to end, even though the pencil lines were all shown, yet the process of construction will be less clear than if the process of development be shown gradually along the drawing. Thus beginning at an end of the example the first pencil lines only may be shown, and as the pencilling progresses to the right-hand, the development may progress so that at the other or left-hand end, the finished inked in and shaded thread may be shown, and between these two ends will be found a part showing each stage of development of the thread, all the lines being numbered in the order in which they were marked. This prevents a confusion of lines, and makes it more easy to follow or to copy the drawing.
[iv] It is the numerous inquiries from working machinists for a book of this kind that have led the author to its production, which he hopes and believes will meet the want thus indicated, giving to the learner a sufficiently practical knowledge of mechanical drawing to enable him to proceed further by copying such drawings as he may be able to obtain, or by the aid of some of the more expensive and elaborate books already published on the subject.
He believes that in learning mechanical drawing without the aid of an instructor the chief difficulty is overcome when the learner has become sufficiently familiar with the instruments to be enabled to use them without hesitation or difficulty, and it is to attain this end that the chapter on plotting mechanical motions and the succeeding examples have been introduced; these forming studies that are easily followed by the beginner; while sufficiently interesting to afford to the student pleasure as well as profit.
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CHAPTER I.
THE DRAWING BOARD.
The T square 18
The triangles 19
Curves 21
Selecting and testing drawing instruments 22
Lead pencils 23
Mixing India ink 25
The drawing paper 26
Tracing paper 29
The ink 30
Testing and selecting India ink 30
Draftsmen's measuring rules 33
CHAPTER II.
THE PREPARATION AND USE OF THE INSTRUMENTS.
Preparing the lining pen for use 34
The shapes of the lining pen points 35
Oil stoning pen points 36
Preparing the circle pen for use 38
The shape for circle pen points 38
Shaping circle pens for very small circles 39
A form of pen point recently introduced; forming the pen point 39
The method of oil-stoning circle pen points 40[vi]
The needle point and pen point 42
How to use the circle pen 43
German instrument to avoid slipping of a needle point 44
How to use the lining pen 45
Applying the ink to the bow-pen 46
Using a straight line or lining pen with a T square 47
CHAPTER III.
LINES AND CURVES.
Explanation of simple geometrical terms; radius; explanation of conventional dotted lines 48
A line at a right angle to another; a point; parallel lines 49
A line produced; a line bisected; a line bounding a circle; an arc of a circle; segments of a circle; the chord of an arc; a quadrant of a circle 50
and 8 more chapters, on drawing mechinery, engine work, and other technical diagrams from scratch
Mechanical Drawing, Self-Taught (Illustrated) Specifications
The object of this book is to enable the beginner to learn to make simple mechanical drawings without the aid of an instructor, and to create an interest in the subject by giving examples such as the machinist meets with in his every-day workshop practice. The plan of representing in many examples the pencil lines, and numbering the order in which they are marked, the author believes to possess great advantages for the learner, since it is the producing of the pencil lines that really proves the study, the inking in being merely a curtailed repetition of the pencilling. Similarly when the drawing of a piece, such, for example, as a fully developed screw thread, is shown fully developed from end to end, even though the pencil lines were all shown, yet the process of construction will be less clear than if the process of development be shown gradually along the drawing. Thus beginning at an end of the example the first pencil lines only may be shown, and as the pencilling progresses to the right-hand, the development may progress so that at the other or left-hand end, the finished inked in and shaded thread may be shown, and between these two ends will be found a part showing each stage of development of the thread, all the lines being numbered in the order in which they were marked. This prevents a confusion of lines, and makes it more easy to follow or to copy the drawing.
[iv] It is the numerous inquiries from working machinists for a book of this kind that have led the author to its production, which he hopes and believes will meet the want thus indicated, giving to the learner a sufficiently practical knowledge of mechanical drawing to enable him to proceed further by copying such drawings as he may be able to obtain, or by the aid of some of the more expensive and elaborate books already published on the subject.
He believes that in learning mechanical drawing without the aid of an instructor the chief difficulty is overcome when the learner has become sufficiently familiar with the instruments to be enabled to use them without hesitation or difficulty, and it is to attain this end that the chapter on plotting mechanical motions and the succeeding examples have been introduced; these forming studies that are easily followed by the beginner; while sufficiently interesting to afford to the student pleasure as well as profit.
---------------------
CHAPTER I.
THE DRAWING BOARD.
The T square 18
The triangles 19
Curves 21
Selecting and testing drawing instruments 22
Lead pencils 23
Mixing India ink 25
The drawing paper 26
Tracing paper 29
The ink 30
Testing and selecting India ink 30
Draftsmen's measuring rules 33
CHAPTER II.
THE PREPARATION AND USE OF THE INSTRUMENTS.
Preparing the lining pen for use 34
The shapes of the lining pen points 35
Oil stoning pen points 36
Preparing the circle pen for use 38
The shape for circle pen points 38
Shaping circle pens for very small circles 39
A form of pen point recently introduced; forming the pen point 39
The method of oil-stoning circle pen points 40[vi]
The needle point and pen point 42
How to use the circle pen 43
German instrument to avoid slipping of a needle point 44
How to use the lining pen 45
Applying the ink to the bow-pen 46
Using a straight line or lining pen with a T square 47
CHAPTER III.
LINES AND CURVES.
Explanation of simple geometrical terms; radius; explanation of conventional dotted lines 48
A line at a right angle to another; a point; parallel lines 49
A line produced; a line bisected; a line bounding a circle; an arc of a circle; segments of a circle; the chord of an arc; a quadrant of a circle 50
and 8 more chapters, on drawing mechinery, engine work, and other technical diagrams from scratch
