As'

ESSAY

ON

ELECTRICITY,

explaining; the

principles of That useful science,*

AND DESCRIBING

THE INSTRUMENTS,

CONTRIVED EITHER TO ILEUS'! RATE THE THEORY, OR RENDERTHE PRACTICE ENTERTAINING.

ILLUSTRATED WITH Six PLATES.

TO WHICH IS ADDED,

A LETTER TO THE AUTHOR, FROM MR. JOHN EIRCH,SURGEON, ON THE SUBJECT OF MEDICAL ELECTRICITY*

BY THE LATE

GEORGE ADAMS,

MATHEMATICAL IN'STRU’MENT MAKER TO HIS MAJESTY* &C\

THE FIFTH EDITION,

WITH CORRECTIONS AND ADDITIONS, BY

WILLIAM JONES,

MATHEMATICAL INSTRUMENT MAKER.

LONDON:

PRINTED BY J; DILLON, AND CO.

FOB, AND SOLD BY, W. AND s. JONES, OPTICIANS,HOLBORN.

1799 *

Ptice 8s. in Boards,