MECHANIC'S TEXT-BOOK

AND

ENGINEER'S PRACTICAL GUIDE:

CONTAINING

A CONCISE TREATISE

ON THE NATURE AND APPLICATION OF MECHANICAL FORCES; ACTION
OF GRAVITY; THE ELEMENTS OF MACHINERY; RULES AND
TABLES FOR CALCULATING THE WORKING EFFECTS OF

MACHINERY; OF THE STRENGTH, RESISTANCE,

AND PRESSURE OF MATERIALS; WITH

TABLES OF THE WEIGHT AND COHE-

SIVE STRENGTH OF IRON

AND OTHER METALS.

BY

COMPILED AND ARRANGED

THOMAS KELT,

OF THE "GLOUCESTER CITY MACHINE COMPANY," N. J.

TO WHICH IS ADDED,

VALUABLE HINTS TO THE YOUNG MECHANIC

ON THE CHOICE

OF A PROFESSION; MISDIRECTION OF INDUSTRY;
INTELLECTUAL CULTIVATION, AND THE

STUDIES AND MORALS OF THE

MECHANIC, ETC., ETC.

BY JOHN FROST, LL. D.

BOSTON:

PHILLIPS, SAMPSON, AND COMPANY.
NEW YORK: J. C. DERBY.

1855.

KD 32580

HARVARD
UNIVERSITY
LIBRARY

Entered according to Act of Congress, in the year 1855,

BY PHILLIPS, SAMPSON & CO.,

In the Clerk's Office of the District Court of Massachusetts.

Stereotyped by
HOBART & ROBBINS,
BOSTON.

CONTENTS.

PRACTICAL GEOMETRY.

Theorems.

Page

To erect a perpendicular on a right line,....

To erect a perpendicular at the end of a line,.

To bisect a given angle,.............

9

10

To describe a circle through three given points

out of a right line,..

10

To find the centre of a given circle,.

11

To find the length of any given arc of a circle, 11

To draw a tangent to a circle,

11

.....

To draw lines toward the centre of a circle,

the centre being inaccessible,

11

To describe the segment of a circle,

To describe an ellipse, or oval,..

13

To describe an elliptic arch,

13

To describe a parabola,..

14

To measure an intercepted line,.

14

To find the distance between two inaccessible

objects,..

15

To design a beam of strongest section,.

To obtain the distance of an inaccessible object, 16

To find the proper position for the eccentric in

To form a square equal to a given triangle,.... 18

To form a square equal to a given rectangle,

To form a rectangle equal to a given square,

To bisect any given triangle,

To describe a circle in a given triangle,.

To form a rectangle in a given triangle,.

18