OF

PHYSICAL MANIPULATION.

BY

EDWARD C. PICKERING,

Thayer Professor of Physics in the Massachusetts Institute of Technology

NEW YORK:
PUBLISHED BY HURD AND HOUGHTON.

Cambridge: The Riverside Press.

1873.

P5

Entered according to Act of Congress in the year 1873, by
EDWARD C. PICKERING,

In the Office of the Librarian of Congress, Washington.