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MATHEMATICS

SELF-TAUGHT

THE LÜBSEN METHOD

FOR SELF-INSTRUCTION, AND USE IN THE PROBLEMS

OF PRACTICAL LIFE

I

Arithmetic and Algebra

ADAPTED FROM THE GERMAN OF

H. B. LÜBSEN

BY

HENRY HARRISON SUPLEE, B. Sc.

Member of the American Society of Mechanical Engineers

Member of the Franklin Institute

PHILADELPHIA

WEST CHELTEN AVENUE