SPIRAL SLIDE RULE.

EQUIVALENT TO

A STRAIGHT SLIDE RULE 83 FEET 4 INCHES LONG, OR, A CIRCULAR RULE 13 FEET 3 INCHES

IN DIAMETER.

PATENT.

MANUFACTURED BY

STANLEY,

GREAT TURNSTILE, LONDON. W. C.
Price 50s.

GEORGE FULLER, M. INST. C.E.,

PROFESSOR OF ENGINEERING IN THE QUEEN'S UNIVERSITY, IRELAND.

LONDON:

E. & F. N. SPON, 46, CHARING CROSS.
NEW YORK: 446, BROOME STREET.

1878.

Price Sixpence.

SPIRAL SLIDE RULE.