TRACTOR PRINCIPLES
THE ACTION, MECHANISM, HANDLING,
CARE, MAINTENANCE AND REPAIR
OF THE GAS ENGINE TRACTOR
BY
ROGER B. WHITMAN
AUTHOR OF
“MOTOR CAR PRINCIPLES,”
“GAS ENGINE PRINCIPLES,”
“MOTOR-CYCLE PRINCIPLES,”
ETC.
FULLY ILLUSTRATED
D. APPLETON AND COMPANY
NEW YORKLONDON
1920
COPYRIGHT, 1920,
BY
D. APPLETON AND COMPANY
PRINTED IN THE UNITED STATES OF AMERICA