Philosophia Britannic a:

OR, ;

A NEW and COMPREHENSIVE

SYSTEM

O F T H E

NEWTONIANPHILOSOPHY, ASTRONOMY,

AND

GEOGRAPHY,

In a Course os Twelve Lectures,With NOTES;

Containing the physical, mechanical, geometrical,and experimental proofs and illustrations ofall the Principal Propositions in every Branch ofNATURAL SCIENCE:

ALSO

A particular Account, of the INVENTION, STRUCTURE,IMPROVEMENT and USES of all the considerableINSTRUMENTS, ENGINES, and MACHINESzWith new calculations relating to their' NATURE, POWER, AND OPERATION.

The Whole collected and methodized from all the principal Authors,and public Memoirs;

And embellished with eighty-one COPPER-PLATES.

By B. MARTIN. ~

THE THIRD EDITION. '

VOLUME II.

LONDON:

Printed for W. Strah'an; J. & F. Rivincton ; W. Johnston;Hawes and Co. T. Carnan and F. Newbery, jun.

B. Collins, in Salilbury ; W. Frederick, in Bath;

And fold by the Author, at his House, in Fleet-street.MBCCLXXL