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To PETER COLLINSON.
September, 1753.
-
Hypothesis of the Sea being the grand Source of
Lightning retracted. Positive, and sometimes
negative, Electricity of the Clouds discovered.-
New Experiments and Conjectures in Support of
this Discovery. Observations recommended for
ascertaining the Direction of the Electric Fluid. —
Size of Rods for Conductors to Buildings.
pearance of a Thunder-cloud described .
TO PETER COLLINSON. 23 November, 1753.
Notice of another Packet of Letters
- Ap-
300
314
Proposal of an Experiment to measure the Time taken
up by an Electric Spark in moving through any
given Space. By James Alexander, of New York 315
Answer to the Foregoing
Remarks on the Abbé Nollet's Letters to Benjamin
Franklin on Electricity. By David Colden, of
New York. 4 December, 1753
.
Electrical Experiments, with an Attempt to account for
their several Phenomena. Together with some
Observations on Thunder-clouds, in further Confirm-
ation of Mr. Franklin's Observations on the Posi-
tive and Negative Electrical State of the Clouds.
By John Canton. 6 December, 1753
To JAMES BOWDOIN. 13 December, 1753.
317
319
330
Concerning the Light emitted by Salt Water. -
The Abbé Nollet's Letters on Electricity
337
To PETER COLLINSON. 18 April, 1754.
Additional Proofs of the Positive and Negative
State of Electricity in the Clouds. - New Method
of ascertaining it
340
Experiments made in Pursuance of those made by Mr.
Canton, dated December 6th, 1753; with Explan-
ations, by Benjamin Franklin. 14 March, 1755 . 341
Turkey killed by Electricity.
Effect of a Shock on
the Operator in making the Experiment
To JOHN LINING. 18 March, 1755.
Differences in the Qualities of Glass.- Account
346
of Domien, an Electrician and Traveller. - Con-
jectures respecting the Pores of Glass. - Origin of
the Author's Idea of drawing down Lightning.-
No satisfactory Hypothesis respecting the Manner.
in which Clouds become electrified. Six Men
knocked down at once by an Electrical Shock.
Reflections on the Spirit of Invention
To M. DALIBARD. 29 June, 1755.
Beccaria's Work on Electricity.-Sentiments of
Franklin on pointed Rods, not fully understood in
Europe. Effect of Lightning on the Church of
Newbury, in New England. - Remarks on the
Subject
To JOHN PRINGLE. 21 December, 1757.
347
355
On the Effects of Electricity in Paralytic Cases
359
To THOMAS HUBBARD. 28 April, 1758.
Electrical Apparatus.- Description of a Battery . 361
TO WILLIAM HEBERDEN. 7 June, 1759.
On the Electricity of the Tourmalin
E. KINNERSLEY TO B. FRANKLIN. 12 March, 1761.
Experiments on boiling Water, and Glass heated by
boiling Water. Doctrine of Repulsion in elec-
trized Bodies doubted. — Electricity of the Atmo-
sphere at different Heights. Electrical Horse-
Electrical Thermometer. In what Cases
the Electrical Fire produces Heat.-Wire length-
ened by Electricity. - Good Effect of a Rod on
the House of Mr. West, of Philadelphia .
race.
To E. KINNERSLEY. 20 February, 1762.
Answer to some of the foregoing Subjects. How
long the Leyden Bottle may be kept charged..
Heated Glass rendered permeable by the Electric
Fluid. Electrical Attraction and Repulsion.-
Reply to other Subjects in the preceding Paper.
Numerous Ways of kindling Fire. - Explosion of
Water. Knobs and Points
Accounts from Carolina (mentioned in the foregoing
Letter) of the Effects of Lightning on two of the
363
367
378
Rods commonly affixed to Houses there, for secur-
ing them against Lightning. 1 November, 1760. 395
Mr. William Maine's Account of the Effects of the
Lightning on his Rod, dated at Indian Land, in
South Carolina, August 28th, 1760
Remarks by Benjamin Franklin.
To MISS MARY STEVENSON. 22 March, 1762.
Concerning the Leyden Bottle
Electrical Experiments on Amber. 3 July, 1762.
JOHN WINTHROP TO B. FRANKLIN.
29 Sept., 1762.
New Observation relating to Electricity in the At-
mosphere
ALEXANDER SMALL TO B. FRANKLIN.
396
398
403
405
Mode of ascertaining whether the Power, giving a Shock
to those who touch either the Surinam Eel or the
Torpedo, be Electrical
412
Addition, 12 August, 1772, in Consequence of the Ex-
periments and Discoveries made in France by Mr.
Walsh, and communicated by him to Dr. Franklin
Of Lightning, and the Methods (now used in America)
of securing Buildings and Persons from its mis-
chievous Effects. September, 1767
JOHN WINTHROP TO B. FRANKLIN, 6 January, 1768.
413
414
St. Bride's Steeple
419
TO MAJOR DAWSON, ENGINEER. 29 May, 1772.
On the Security of the Powder Magazines at Pur-
fleet.
Report on Lightning Conductors for the Powder Maga-
zines at Purfleet. 21 August, 1772
Experiments, Observations, and Facts, tending to sup-
port the Opinion of the Utility of long, pointed
Rods, for securing Buildings from Damage by
Strokes of Lightning
Description of a Portable Apparatus, invented by Mr.
John Canton, for the Purpose of easily demonstrat-
ing Dr. Franklin's fundamental Principles of Elec-
tricity
To M. DUBOURG. 10 March, 1773.
427
430
435
446
On the Analogy between Magnetism and Electricity 450
M. DUBOURG TO B. FRANKLIN. 25 March, 1773.
On the Choice of Glass for the Leyden Experiment 453
To MESSRS. DUBOURG AND DALIBARD.
Concerning the Mode of rendering Meat tender by
Electricity
456
To M. DUBOURG. 1 June, 1773.
In Answer to some Queries concerning the Choice
of Glass for the Leyden Experiment
459
TO JOHN WINTHROP.
25 July, 1773.
On Conductors of Lightning
461
Queries on Electricity, from Dr. Ingenhousz; with An-
swers by Dr. Franklin
462
To JOHN INGENHOUSZ.
An Attempt to explain the Effects of Lightning on
the Vane of the Steeple of a Church in Cremona,
August, 1777
The Leyden Phial, and M. Volta's Experiment
TO JOHN INGENHOUSZ. 16 May, 1783.
On an Electrical Experiment
On the Shock by the Electric Bottle, and the Density
of Glass.
467
476
TO EDWARD NAIRNE. 18 October, 1783.
On his patent Electrical Machine, and the Effects of
Lightning on the Eyes of Animals killed by it
479
No. II. Letter from the Abbé Nollet to Benjamin Franklin 493
No. III. Speech of the Earl of Macclesfield, President of
the Royal Society, on the Occasion of awarding to
Franklin a Medal for his Discoveries in Electricity
499
No. IV. Letter from John Baptist Beccaria to Benjamin
Franklin.
505
No. V. Letter from Professor Thorbern Bergman, of Up-
sal, to Benjamin Wilson
513
No. VI. Letter from M. Dubourg to M. de Lor. Parallel
between the Theories of Franklin and Nollet .
514