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ESSAY

Ο Ν

ELECTRICITY,

CONTAINING

A Series of EXPERIMENTS

Introductory to the Study of that SCIENCE;

In which are included

Some of the latest DISCOVERIES;

INTENDED CHIEFLY

With a View of facilitating its APPLICATION,

and extending its UTILITY

In MEDICAL PURPOSES.

B R I S TOL:

Printed for J. B. Becket, opposite the Exchange, Bristol; Sold

by T. Becker, in the Strand, and G. ROBINSON, in Pater-
nofter-Row, London; D. PRINCE, at Oxford; W. FREDERICK,
at Bath; and E. Score and B. Thorn, at Exeter:

MDCCLXXIII.

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ADVERTISEMEN T.

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SEVERAL Persons in this City, who have lately fur-
nished themselves with Electrical Machine.j

; bave
repeatedly desired me to give them a few plain Directions
for the Use and Management of it to put them in a Me-
thod of adjusting the Apparatus for various Purposes, and
to draw up a Series of such EXPERIMENTS as might tend
to facilitate the Study of the Science.

I sate down the more readily to attempt this, from observing that verbal Directions, and even repeating the Experiments before them, were seldom sufficient either to convey a proper Idea of the Nature of Ele&ricity, to those who were Strangers to it, or to prevent their being frequently at a Loss in some Part of the Operation.

I had, at first, no farther Intention than merely to draw up such Directions and Observations as immediately occurred to me, for the Use of a few Persons who particularly desired them; but being at the Same Time desirous of promoting a farther Enquiry into the Subjeet, which I am perswaded is of some confiderable Importance to Mankind, I was led by this Motive to colleet several of the most useful Observations from judicious Writers; and, by adding some of the latest Discoveries, to exhibit a short View of the present State of Ele&tricity, which I am now induced to commit to the Candour of the Public, whose Favours already conferred, will be ever gratefully acknowledged, by

Their devoted,

and obedient Servant,

BRISTOL,
May, 1773.

J. B. Becket.

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