Mechanical Drawing Self-Taught - Comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing; together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers

Joshua Rose

Informations

• Publié par: pecen
• Publié le: 08 décembre 2010
• Nombre de lectures: 27
• Langue: English

Extrait

The Project Gutenberg EBook of Mechanical Drawing
Self-Taught, by Joshua Rose
This eBook is for the use of anyone anywhere at no
cost and with
almost no restrictions whatsoever. You may copy it,
give it away or
re-use it under the terms of the Project Gutenberg
License included
with this eBook or online at www.gutenberg.org
Title: Mechanical Drawing Self-Taught
Author: Joshua Rose
Release Date: November 4, 2007 [EBook #23319]
Language: English
*** START OF THIS PROJECT GUTENBERG EBOOK
MECHANICAL DRAWING SELF-TAUGHT ***
Produced by Joseph R. Hauser, Ross Wilburn and the
Online
Distributed Proofreading Team at http://www.pgdp.netMechanical Drawing Self-
Taught:
COMPRISING
INSTRUCTIONS IN THE
SELECTION AND PREPARATION
OF DRAWING INSTRUMENTS,
ELEMENTARY INSTRUCTION IN
PRACTICAL MECHANICAL DRAWING;
TOGETHER WITH
EXAMPLES IN SIMPLE GEOMETRY AND
ELEMENTARY MECHANISM, INCLUDING
SCREW THREADS, GEAR WHEELS,
MECHANICAL MOTIONS, ENGINES AND
BOILERS.
BY JOSHUA ROSE, M.E.,
AUTHOR OF "THE COMPLETE PRACTICALMACHINIST," "THE PATTERN MAKER'S
ASSISTANT," "THE SLIDE VALVE"
ILLUSTRATED BY THREE HUNDRED AND
THIRTY ENGRAVINGS.
PHILADELPHIA:
HENRY CAREY BAIRD & CO.,
INDUSTRIAL PUBLISHERS, BOOKSELLERS AND
IMPORTERS,
810 WALNUT STREET.
LONDON:
SAMPSON LOW, MARSTON, SEARLE &
RIVINGTON,
CROWN BUILDINGS, 188 FLEET STREET.
1887.
Copyright by
Joshua Rose.
1883.PHILADELPHIA.
COLLINS, PRINTER
PREFACE.
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, andmakes it more easy to follow or to copy the drawing.
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.
New York, February, 1883.
CONTENTS.
PREFACE.
CHAPTER I.THE DRAWING BOARD.
1
The T square
8
1
The triangles
9
2
Curves
1
2
Selecting and testing drawing instruments
2
2
Lead pencils
3
2
Mixing India ink
5
2
The drawing paper
6
2
Tracing paper
9
3
The ink
0
3
Testing and selecting India ink
0
3
Draftsmen's measuring rules
3
CHAPTER II.
THE PREPARATION AND USE OF THE INSTRUMENTS.
3
Preparing the lining pen for use
4
3
The shapes of the lining pen points
5
3
Oil stoning pen points
6
3
Preparing the circle pen for use
8
3
The shape for circle pen points
8
3
Shaping circle pens for very small circles
9
A form of pen point recently introduced; forming the 3
pen point 9
4
The method of oil-stoning circle pen points
0
4
The needle point and pen point
2
4
How to use the circle pen
3
German instrument to avoid slipping of a needle poi 4
nt 4
4
How to use the lining pen
5
4
Applying the ink to the bow-pen
6
4
Using a straight line or lining pen with a T square
7CHAPTER III.
LINES AND CURVES.
Explanation of simple geometrical terms; radius; exp 4
lanation of conventional dotted lines 8
A line at a right angle to another; a point; parallel lin 4
es 9
A line produced; a line bisected; a line bounding a ci
5
rcle; an arc of a circle; segments of a circle; the cho
0
rd of an arc; a quadrant of a circle
A sector of a circle; a line tangent to a circle; a semi
5
circle; centre of a circle; axis of a cylinder; to draw a
1
circle that shall pass through three given points
To find the centre from which an arc of a circle has 5
been struck; the degrees of a circle 2
5
The protractor
3
5
To find the angle of one line to another
4
5
To find the angles of three lines one to the other
5
5
Acute angles and obtuse angles
7
Triangles; right angle triangle; obtuse angle triangle; 5
equilateral triangle; isosceles triangle 8
Scalene triangle; a quadrangle; quadrilateral or tetra 5
gon 9
6
Rhomboid; trapezoid; trapezium
06
The construction of polygons
1
6
The names of regular polygons
2
6
The angles of regular polygons; the ellipse
3
6
Form of a true ellipse
9
7
The use of a trammel for drawing an ellipse
2
7
To draw a parabola mechanically
3
7
To draw a parabola by lines
4
7
To draw a heart cam
5
CHAPTER IV.
SHADOW LINES AND LINE-SHADING.
7
Section lining or cross-hatching
7
To represent cylindrical pieces one within the other;
7
to represent a number of pieces one within the othe
8
r
To represent pieces put together and having slots or 7
keyways through them. 9
8
Effects of shading or cross-hatching
0