J. A. GILLET,
PROFESSOR OF PHYSICS IN THE NORMAL COLLEGE OF THE CITY OF NEW YORK,
AND
W. J. ROLFE,
FORMERLY HEAD MASTER OF THE HIGH SCHOOL,
CAMBRIDGE, MASS.
WITH SIX LITHOGRAPHIC PLATES AND FOUR HUNDRED
AND SIXTY WOOD ENGRAVINGS.
POTTER, AINSWORTH, & CO.,
NEW YORK AND CHICAGO.