MR. HARDY'S TIME-KEEPER.

In the last Volume will be found a very detailed account of the Escapement, Train, and Pendulum of Mr. Hardy's Timekeeper, for which the large Gold Medal and Fifty Guineas were voted to him in the Session 1819-20. The subjoined account of the rate of going of two of Mr. Hardy's Clocks, one at the Royal Observatory Greenwich, the other at the Royal Military College, Sandhurst, will no doubt be both interesting and satisfactory.

PRESENTS

RECEIVED BY THE SOCIETY

FROM JANUARY 1821, TO DECEMBER 1821,

With the Names of the Donors.

The Presents from the two following Donors having been incorrectly inserted in the List contained in the last Volume, are reprinted, with the necessary corrections.

GEORGE REVELEY.

SPRAT's History of the Royal Society of London, 4to.
A Plan and View of the Chain Bridge erecting over the
Menai at Bangor Ferry.

A Copy of the Declaration of the Independence of the United States of America.

WILLIAM WYON.

The Dies of the new large Medal of the Society, executed by him.

THE ACADEMY OF ST. PETERSBURGH.

Mémoires de l'Academie Imperiale des Sciences de St. Petersbourg, 5 Vols., 4to.

A. AINGER.

A Treatise on new Philosophical Instruments for various in the Arts and Sciences, with Experiments on Light and Colours, by David Brewster, LL.D., 8vo.

purposes

THE AMERICAN ACADEMY OF ARTS, &c.

Memoirs of the American Academy of Arts and Sciences, Part 2 of Vol. 4, 4to.

THE SOCIETY OF ANTIQUARIES.

Archæologia, Part 2nd, Vol. 19, 4to.

THE ASIATIC SOCIETY.

Asiatic Researches, Vol. 13, 4to.

JAMES ASPERNE.

The European Magazine, Vols. 78, 79, 8vo.

JOSEPH ATTERSOL.

A Sample of Sugar from Beet-root.

THE AUSTRIAN GOVERNMENT.

The Journal of the Polytechnic Institution at Vienna, Vol. 2, 8vo.

THE AUTHOR.

An Essay on the Political Economy of Nations; or, A View of the Intercourse of Countries, as influencing their Wealth,

8vo.

THE AUTHOR.

An Attempt to Analyse the Automaton Chess Player of Mr. De Kemphelen, 8vo.

EZEKIEL BAKER.

Remarks on Rifle-guns, being the Result of Forty Years Practice and Observations. With Specific Remarks on Fowling Pieces, 8vo.

MAJOR-GENERAL BEATSON.

The Supplement to Major-General Beatson's System of Cultivation, 8vo.

JOHN THOMAS BARBER BEAUMONT.

An Essay on Criminal Jurisprudence, with the Draft of a New Penal Code. (A Pamphlet).

Two Medallions.

J. BISSET.

THE TRUSTEES OF THE BRITISH MUSEUM.

Engravings of the Ancient Marbles in the British Museum, Vols. 3 and 4, 4to.

RICHARD BROWN.

The Rudiments of Drawing Cabinet and Upholstery Furniture, 4to.

M. I. BRUNEL.

Observations by M. Hachette, on the Electro-Mag