CONTENTS

Page

INTRODUCTION 5

HISTORY OF TRUCK LOGGING 5

First use of motor truck in logging—Development of logging trailer—Possibilities in the use of motor trucks.

TRANSPORTATION OF LOGS—RAILROADS VERSUS MOTOR TRUCKS 7

Comparative advantages and uses of motor trucks and railroads—Relative cost of road construction—Advantage of flexibility of motor trucks.

COSTS 8

Operating costs of a typical 5-ton truck—Actual cash outlay—Total expense—Variable charges—Recapitulation of work performed.

ROLLING STOCK EQUIPMENT 10

Rigid versus flexible truck bodies—Chain drive versus worm drive—Weight of trucks—Speed—Depreciation.

INSURANCE 14

Fire and theft insurance—Collision insurance—Liability insurance—Property damage insurance.

TRUCK EQUIPMENT 14

Bunks—Tires—Relative advantages of different types of tires—Laws governing operation of motor vehicles—Legal limit of weight of load—Chain drives—Tops.

TRAILERS 17

Draw-bar pull of motor trucks—Effect of grades on draw-bar pull—Advantage of trailer—Description of trailer—Brakes on trailer—Air brakes on trailers.

LIFE AND DEPRECIATION 20

COST DATA 20

Operating expenses for 31⁄2 and 5-ton trucks—Fixed charges—Total expenses.

ROAD CONSTRUCTION 24

Sub-grade—Cross-plank roads—Fore and aft pole roads—Cement roads—Guard rails—Cost of road construction.

BRIDGES 36

TURNING DEVICES AND TURNOUTS 37

Construction of turn-tables—Turning of trucks.

TELEPHONES 39

INCLINES 39

Snubbing methods—Practicability of inclines.

YARDING 41

LOADING AND UNLOADING 41

Methods of loading trucks—Loading with boom—Rigging of boom—Unloading.

TIME STUDIES 45

CONCLUSION 46

Future use of the motor truck—Motor trucks and forestry.

BIBLIOGRAPHY 48