MECHANIC'S TEXT-BOOK

AND

ENGINEER'S POCKET 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.

COMPILED AND ARRANGED

BY THOMAS KELT,

GLOUCESTER CITY MACHINE COMPANY," N. J.

OF THE

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

PHILLIPS, SAMPSON AND COMPANY,

No. 110 WASHINGTON STREET.

Math L
gt.

3.28-35

Theorems.

CONTENTS.

PRACTICAL GEOMETRY.

Page

To erect a perpendicular on a right line,...... 9

To erect a perpendicular at the end of a line,.. 9

To bisect a given angle,....

10 ·

To describe a circle through three given points

out of a right line,...

To find the centre of a given circle,.

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,

14

......

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 find the length of valve-levers,

a steam-engine,

To define the throw of an eccentric,..

To describe any regular polygon,..

To construct a square upon a right line,..

16

16

17

17

18

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,.