Star.
London, England, 1805-11-04 00:00:00

Juft ribrdlied, price is. 6d.

The Second Edition, eorreaed end Unproved, of
TAYLOR's USEFUL ARITHMETIC ; or, the
molt neceffary parts of the Science of Numbers rendered
Eafy. Ago. a Key to the Ufeful Arithmetic! containing Anfwers
to all the (t_leftictos and Eaeresifes, and Diredions for the Solution,
price Is.
" Mr. Taylor's Ufeful Arithmetic is better calculated to in.
Rend a child, fn far as the rule of Pradtice, than any other little
treadle we knnw extant."—Critieal Review, for Dc:.
.4 The ohjed propufed io this enricife treatife. is to facilitate the
progrefs of children In the &it rudiments of Arithmetic. An eafy
and familiar mode of explanation is therefore employed. The at
coition of the author to the utility of the wont, and the
which he has raised, appear to prornife it a favourable recep•
don."—Monthly Review, Jan. z 8,5.
" This traa will be found very ufeful as an initiatory treatife.
I The Key is a nctelfary appendage, and it cousins a [cobble intro-
' dudion, which points out the made of applying this work to the
in iirtullion of youth."—Eciedic Review, Match, zgos.
Printed for the Author, and fold by Longman, Hut ft, Rees, and
Orme, No 39, Paternolter row.

This day was pubillbed, priceoow Guinea, in boasts,

FERGUSON'S LECTURES on Seleft Subjects,
1. In Mechanics, Hydroßada, Hydraulics. Pnetnades, Op •
tics, Geography, Altronomy. and Dialling. A new Wiliam, cor-
reded and enlarged. With Notes and an Appeadix, adapted to
the prcfcnt hate of the Ars and Sciences.

By DAVID BREWSTER, A.M.
In two Volumes, with a Quarto Volume or Plate*.

Edinburgh: Printed for Hell ani Brailfnte„ J. Eakinins, Mite-
&Al and Son. Edinburgh; J. and A. G tafgow ; and 1 hosi
ORA Ave Maria-lane, London.
Betides the copious Notes, with which, in this Edition, the
Text of Fergufon is corichcd,the Appendix amain' the following
original Articles, vie.

- .
MECHANICS.
On the Conftruetion of tinder(hot Wheel., for turning Maelti-
nery. On the coultroftion of the Mill Courfc—On the Water
Wheel and its Float Board.-.On the Spur Wheel and Trundle—
On the formation, flee, and velocity of the Milltlone-e-On the
per romance of Undreamt Mils—On a new Mill Wright's Table
—Ott Horizontal Mills—On Double Corn Miiii.—Ots Breaft Mills.
Praetleal Remarks on the performance and conftruell as of Over.
dim Water Wheels. On the method of computing the effeetive
Power of Overawe -Wheels In turning Machinery—An the
pet forma:tee of Overlhot wad Uoderfhot Mills—On the foundation
of the Buckets. and the proper velocity of °realm Wirels.. Ac-
count of an im ent in Flour Mills. On the formation of
the Teeth of and the Leaves of Pinion.. On the formanes
of Fpicycloia, mechanically, and an the difpofition of the Teeth
oti the Wbeel's circumlereocre-.-On tke formation of Cycloid% and
Epicycloids, geometries/Iy, and the method of drawing Lines pa-
talk! to tent—On bevelled Wheels, and the method of giving an
Fpieyeloidal form to their Teeth. On the formation of the Teeth,
of Rack Work, the Wipers of Stamper', ace. On the Nature and
Cooßruetiou of Windmills. Defeription of a Windotill.-.on
the form and pofition of Winduntil Salt—To find the momen-
tum of Frietion—To find the velocity of the Wind—.on the
effeet of Windmill Sails—On horizontal Windmills, On the
Nature of Friction, and the method of diminifbing its er-
red, in Machinery. On the•Natore and Operation of Fly Wheels.
..—On Wheel Carriages—On the formation of Carriage Wheel,—
On the pufition of the Wheels—On the line of Tradlien, and the
method by which Horfes etc= their ftrength—On the paidon of
the Centre of Gravity, and the manner of difpofing the Load—
On the Thrashing' Machine—On lltrafhiog Machines drives) by
Water —On Tht dieing Machines driven by Horfes-.-On the power
of Thrafiting Machines—On the eerftruelion and effea of Ma..
_ _

chines, meninonicated by Mr. John Lathe, Profeffor of Mathe-
ntaties in the tfniverfity of Edinburgh—Defeription of a fimple
and powerful Capftain—A mechanical Method of finding the
Come of Gravity.

HYDRAULICS.

On the Steam Engine—On the' power of Steam 'Engines, and
the method of compoting it—Defcription of a Water Mowing Ma-
chine. OPT!: S.

On Achromatic 1 eldiopew-.on Achromatic Mk* Glaffev—
Ou Achromatic Eye-elects—On the conftruetion of Optical In-
Rruittain with Tables of their Apertures. Rt. and the method of
grinding the Lades and of which they arc oompofed. Ou
the method of grinding and polithing Lenfeis—On the method of
grinding and poldhing the Mirrors of Rl:Reding Telekopev—On
the Single Microfropc-On the Double Microlcope....On the Re-
in' ling Telefeope—On the Gregorian Telefcope-...0n the Cafe-
grainian Telefeope—On the Newtonian Tekferipe. Defeription
of a new Fluid Mierofeope, invented by the Editor.
DIA LLANO
Deferlption of an analanunatic -Dial, which fail Itrelf.mrefcrip-
don *fa new Dial invented by Lambort.
ASTRONOMY.
_ _ _