: The Elements of Geology; Adapted to the Use of Schools and Colleges by Loomis Justin R Justin Rudolph - Geology

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Transcriber's note: Text enclosed by underscores is in italics . In view of the difficulty of reliably distinguishing 18th-century variant spellings from typographical errors, the text has been reproduced entirely as printed.

EXPERIMENTS

OBSERVATIONS

ELECTRICITY,

MADE AT

Mr. BENJAMIN FRANKLIN,

The PREFACE.

Place an electrised phial on wax; a small cork-ball suspended by a dry silk-thread held in your hand, and brought near to the wire, will first be attracted, and then repelled: when in this state of repellency, sink your hand, that the ball may be brought towards the bottom of the bottle; it will there be instantly and strongly attracted, 'till it has parted with its fire.

If the bottle had an electrical atmosphere, as well as the wire, an electrified cork would be repelled from one as well as from the other.

FIG. 1. From a bent wire sticking in the table, let a small linen thread hang down within half an inch of the electrised phial . Touch the wire of the phial repeatedly with your finger, and at every touch you will see the thread instantly attracted by the bottle. . As soon as you draw any fire out from the upper part by touching the wire, the lower part of the bottle draws an equal quantity in by the thread.

FIG. 2. Fix a wire in the lead, with which the bottom of the bottle is armed, so as that bending upwards, its ring-end may be level with the top or ring-end of the wire in the cork , and at three or four inches distance. Then electricise the bottle, and place it on wax. If a cork suspended by a silk thread hang between these two wires, it will play incessantly from one to the other, 'till the bottle is no longer electrised; that is, it fetches and carries fire from the top to the bottom of the bottle, 'till the equilibrium is restored.

FIG. 3. Place an electricised phial on wax; take a wire in form of a C, the ends at such a distance when bent, as that the upper may touch the wire of the bottle, when the lower touches the bottom: stick the outer part on a stick of sealing wax which will serve as a handle. Then apply the lower end to the bottom of the bottle, and gradually bring the upper-end near the wire in the cork. The consequence is, spark follows spark till the equilibrium is restored. Touch the top first, and on approaching the bottom with the other end, you have a constant stream of fire, from the wire entering the bottle. Touch the top and bottom together, and the equilibrium will soon be restored, but silently and imperceptibly; the crooked wire forming the communication.

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