TABLE OF CONTENTS.

Page

PREFACE.

INTRODUCTION 1

CHAPTER I.

RULES FOR TRACING THE LINE OF A NEW ROAD, P. 35.

Tracing the Line of a new Road —Surveys - 35

Mountains, Hills , and Valleys - 37

Rivers ----- - 50

Bogs and Marsh Ground - - - 51

Materials—Exposure—Evaporation 52

CHAP. II.

PRINCIPLES OF ROAD-MAKING,

p. 56.

Strength of Roads ----- 64

Application of the Principles of Moving Bodies 66

Collision—Friction - - - 67

Hardness - - 69

Machine for measuring the Power of Traction 73

Traction on different Kinds of Roads - 74

Elasticity - - - - - 76

Erroneous Rules - - - - 78

A 3