CONTENTS

Page
[INTRODUCTION][5]
[HISTORY OF TRUCK LOGGING][5]
[First use of motor truck in logging]—[Development of loggingtrailer]—[Possibilities in the use of motor trucks].
[TRANSPORTATION OF LOGS—RAILROADS VERSUS MOTOR TRUCKS][7]
[Comparative advantages and uses of motor trucks and railroads]—[Relativecost of road construction]—[Advantage of flexibility of motor trucks].
[COSTS][8]
[Operating costs of a typical 5-ton truck]—[Actual cashoutlay]—[Total expense]—[Variable charges]—[Recapitulationof work performed].
[ROLLING STOCK EQUIPMENT][10]
[Rigid versus flexible truck bodies]—[Chain drive versus wormdrive]—[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 differenttypes of tires]—[Laws governing operation of motor vehicles]—[Legal limit of weightof load]—[Chain drives]—[Tops].
[TRAILERS][17]
[Draw-bar pull of motor trucks]—[Effect of grades on draw-barpull]—[Advantage of trailer]—[Description of trailer]—[Brakes on trailer]—[Air brakes on trailers].
[LIFE AND DEPRECIATION][20]
[COST DATA][20]
[Operating expenses for 31⁄2and 5-ton trucks]—[Fixed charges]—[Total expenses].
[ROAD CONSTRUCTION][24]
[Sub-grade]—[Cross-plank roads]—[Fore and aftpole 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]

INTRODUCTION

In this paper an attempt has been made to bring together some useful facts concerning the application of the motor truck to the logging industry. The term “motor truck” as here used is applied to the ordinary truck type of motor vehicle with trailer adapted to carrying logs, and does not include the “tractor” and the “caterpillar tractor.” These latter types present special problems of their own. In the following pages the discussion of motor truck logging is premised upon conditions as they exist in the forests of the Pacific Northwest.

HISTORY OF TRUCK LOGGING