The Sun.
London, England, 1806-05-26 00:00:00

GREGORY's MIECHANICS,

In TWo large O davo•Volumes; besides a Volume containing
fifty-five Quarto Plates.
• This Day was published, price il. 16s. in hoards,
A TREATISE of .MI!:CHANICS, 'Theoretizal,
Przdical, and Descriptive.
By O,LINTI-11JS'GREGORY, .
Of the Royal Military•Acaderny, Woolwich.
Vol; I. Book 1. (fin Statics, comprising the Composition
and Resolution of Fotce, the Centre of Gravity, and the Cen-
trobarye Method, Mechanical Powers, Strength and Stress of
Materials, and the- Theory of Cords, Arches, and Domes.
.Book 2. Dynamics, in :which are treated Motions, De-
scents and Ascents along.different Lines and Curves,. Pro-,
jeetiles, Ricochet-firing, Pendulums, Central-fores,• Ce -
tres of Oscillation, Spontaneous Rotation' &c'.. .Don Juan's
Theory 'of Percussion, and the motion of Machines and their
maximum efEzts.
•• Book. 3. Hydrostatics, including" the pressure of non-
elaStic Fluids, thespecific Gravity of solid and fluid Bodies,
With an•extensive Table, the' Equilibrium, Stability, and Os-
dilations of floating Bodies, and capillary Attraction.
Book 4. Hydrodynamics, treating of thedischarge of Fluids
through Apertares,and of thcrnotions of Water-wheels;with
accounts of important experiments on those interesting
topics.
Book 5. Pneumatics, including the equilibrium and Mo.
tion of Air, and• other elastic Fluids; the measurement of
Altitudes by the Barometer and Thermo Meter the Theory
of Air and at Water.pumps, and the resistance of Fluids.
• Vol. 11. Contains Remarks on the Nature, Construdion,
and Simplificatilan of Machinery, on Frittion and the• Rigidity
of Cords, First Movers, &c.• with Tables. and Descriptions of
nearly two hundred curious and usetnl Machines ; of which,
however, only a few can be specified in an Advertisement.,
Atwood's ingenious Apparatus tbr variable Motions.
Improved Beam Compasses, by Walton.
Peony's Condenser of Forces,, applicable to Wind-mills.
Cranes, by Gottlieb, Andrews, Hall, Whyte, Hardie, &c.
Hydraulic Engines, i. e, the Tyrripanuin, the Noria, De
La Faye's Wheel, the Persian Wheel, Chain. pumps ;.Hero's
Fountain, Darwin's Engine, Hungarian Machine, the Spiral
Pump, Dcsaguliers's Drawer and Bucket,,Sarjeant's Machine.
Dearborn's Engine, :tee.
Oil-mills and Ordixece Boring.-machines.
Contrivances for Parallel, Motions, by Cartvirright, Dry..
den, &c.
Various• Pumps; with Remarks on Pistons and Valves.
Rainsden's Machine for Dividing Matlitmatical Instru-
ments. .
• Contrivances for reversing and changing Motions. •
ScapementS, by Graham, Mudge, De Lafons, &c.
Steam Engines, by Newcomen,- Blakey, Gainsborough,
Watt., Homblower, Cart Wright, Murray;; Bettancourt,
Woolf, &c.
Brainah's Machine for planing different kinds of Shit-aces.
Rules for forining Teeth and-- Wipers, with Maudsley's

Teeth-cutting Apvratus. • - . .
flolizontAl, vertical, and circular Saw-mills. - • .
Tide-aril (a • subjeCt never before treated in any English i
work), with contrivances by Cosset, Lloyd, and_Dryden. I
Turning Apparatus, by tvlaudaley and:Smart. • .. 1
Water mills, Under-snot, over-snot,.spiral, floating, &c.
Wind-mills, vertical, horizontal, &c. by Verrier, Beatson, .1.
i

•
Bywate-r, find others. . .
Printtti for C. Keat'siey, Fleet-street, London: where may
likewise be haul, this Autitor's Treatise out Astronomy, price I,
tS, troar,4s ; ai;sl Dis, Lessons AstrQui...and-ritilos. price 45, 1
t
tx..41,L,