# Book:Alfred E. Holbrow/Geometrical Drawing/Twelfth Edition

## Alfred E. Holbrow: Geometrical Drawing and its Practical Applications (12th Edition)

Published $\text {1944}$, George Gill & Sons, Ltd.

### Contents

Preface
Preface -- Second Edition

PLANE GEOMETRY
Section $\text {I}$. -- Introduction.
Units of Measurement, Measuring Equipment, Use of a Line and Pins, Drawing and Drawing Material.
Section $\text {II}$. -- Lines and Angles
Definitions, Simple Problems with Practical Applications Measuring obstructed lines in the field, Perpendiculars and Parallels, Use of Set Squares and Protractors, Angle Measuring in the open, Prismatic Compass, Out-door Records.
Section $\text {III}$. -- Division of Lines, and Construction of Scales
Simple Problems in the Division of Lines, Construction of Scales, Diagonal Scales, Scale of Chords, Proportional Division of Lines, Graphic Determination of Proportional Parts.
Section $\text {IV}$. -- Triangles
Definitions, Necessary Data, Applications to Out-door Measuring, Use of the Plane Table, The Theodolite, Measurement of Inaccessible Objects and determination of Heights.
Section $\text {V}$. -- Quadrilaterals
Simple and Practical Problems of the Square, Rectangle, Rhombus, Rhomboid, etc., Measuring and Plotting Regular and Irregular Quadrilaterals, Applications to Field Work.
Section $\text {VI}$. -- Polygons
General Constructions, Particular Methods of setting out applicable to Certain Figures, Measurement of Regular Polygons, the Recording of Dimensions, Correction of Error.
Section $\text {VII}$. -- Areas
The Area of Plane Figures, Construction of Figures of Required Area, Division of Areas, Areas of Measured Ground.
Section $\text {VIII}$. -- Circles and Lines
Definitions, Building up Curves, the Circle and Line, Draughtsmanship, Circles in Contact, Field Work and Examples.
Section $\text {IX}$. -- The Ellipse
Deduction, Definitions and Properties, Methods of setting out on paper and practically. Use of the Trammel, Line and Pins.
Section $\text {X}$. -- Inscribed and Circumscribing Figures
Utilising the Problems of the previous Sections, with Applications to Inscribed and Circumscribed Triangles, Squares, Polygons, Circles and Semi-Circles. Application to Ornamental Work and Draughtsmanship.
Section $\text {XI}$. -- Copying, Enlarging and Reducing
The Application of Geometrical Principles to the Copying, Enlarging and Reducing of given figures, Copying from Dimensioned Diagrams, Use of Squares in enlarging or reducing.
Section $\text {XII}$. -- Geometrical Ornament
The application of the Triangle, Square, Polygon etc., to Network, Borders, Diaper patterns; Interlaced Borders, Filling Enclosed Areas, Sub-division of Rectangles, Circles; Construction of Arch Outlines.

SOLID GEOMETRY
Section $\text {XIII}$. -- Solids and Simple Projection
Geometrical Solids, their appearance, properties and general features; Construction of Models in Paper, Card and Wood; Principles of Projection, Plans and Elevations.
Section $\text {XIV}$. -- Auxiliary Views and Sections
Projection of Geometrical Solids and other objects in more difficult positions, Sections of Solids and the Development of the Surfaces.
Section $\text {XV}$. -- Pictorial Projection
Types of Pictorial Projection, Oblique Projection, Objects in Isometric Projection.
Section $\text {XVI}$. -- Workshop Drawings
Dimensioned Scale Drawings of the equipment illustrated in the earlier sections, Wood Models, Drawing Board, Tee and Set Squares, Plane Table and Tripod, Prismatic Compass, A Model Theodolite.
Section $\text {XVII}$. -- Points, Lines and Planes
An Introduction to the Projection of Points, Lines and Planes. Determination of Inclination, True Length, Explanatory Models, Planes in various positions, Intersecting Planes.

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