ENGRAVINGS, | 
@ Vol. XXXVIII. Mr. Donxtn’sTachometer.—Mr. At Lan’s Mathematical 
Dividing Engine.—A 4to Plate of Mr. Loescuman’s Patent Piano-Forte, 
nd Mr. Liston’s Patent Euharmonic Organ.—A Plate to illustrate Mr. 
WI auy’s Paper on the Electricity of “Minerals.—Mr. WaAtkeER’s improved 
WMicrometer.—Mr. Movrvr’s Filtering Apparatus —Mr.$mita’s Method of 
ielieving a Horse fallen in the Shafts of a loaded Cart,—Mr. Joun Taytor’s 
WAir-Exhauster for Mines. —A Representation of the Comet now visible in 
(rsa Major.—Sir Howarp Doveras’s Patent Reflecting Semicircle.— 
WA coloured Map to illustrate Dr. Campget.’s Paper on the inferior Strata 
'the Earth occurring in Lancashire—Mr. Saptier’s Apparatus for 
3m elting of Lead.—A Plate to illustrate Mr. Witiiam Smiru’s and Mr. 
MaDWARD Martin's Reports on the State of the Collieries at and near Nail- 
| in Somersetshire.—Mr, SapieR’s Apparatus for Smelting of Lead.— 
WA Plate to illustrate the different Theories of Arches or Vaults,and of Domes, 
Vol. XXXIX. Mr. Sreevens’s New Levelling-Staff—A Map illustrating 
ike Great Derbyshire Denudation.—A Quarto Plate to illustrate the Opti- 
ipal Instrument called the Diacatoptron.—A Plate of Mr. Steevens’s 
ontrivance for freeing Water-pipes from Air: engraved by Mr. Porter.— 
\Mr. Auvan’s improved Reflecting Circle——Mr. Woon’s inclosed Grind- 
Witone for Pointing Needles, and Mr, Wensrir’s Method of carrying off 
Steam from Boilers—Mr. Bronton’s improved Pump for raising Water 
| hile Shafts or Pits are sinking.-Mr. Hopeson’s improved Mariner’s 
Jompass for correcting the Magnetic Variations—A Quarto coloured Plate 
p illustrate the Geology of art of the Vie nity of Dublin. 
\ _ Vol. XL. A Plate to illustrate the Foundation of Mr. W1LL1aM Jonzs's 
yemporary Corn Rick.—Mr. Sreruens’s Method of dividing Bricks,— 
dBection of Mr. Wittiam Jones's temporary Corn Rick.—Mr. WaisTzut’s 
mprovement on the Acorn Dibble.— A Plate to illustrate Mr. Tawney’s 
New Thrashing Machine.—Two Octavo Plates descriptive of a New Ma- 
Nihine for Pumping Water.—Two Plates descriptive of the Muscular Mo- 
Mion of Snakes.—Figures to illustrate such Portions of a Sphere as have 
sir Attraction expressed by an algebraic Quantity—Van Hetmont’s 
‘Differential Thermometer.—Formation of Ovals for Gardeners.~-CHAVASSE’S 
YMarine Transit—-A Plate to illustrate Mr. Bropiz’s Experiments on 
Nhe Influence of the Brain on the Generation of Animal Heat. 
MP) Vol. XLI, Perys’s Mercurial Voltaic Conductor.—Lesure’s Dif 
erential Thermometer. Diagrams to illustrate Dr. WoLLaston’s Peri- 
topic Camera Obscura and Microscope.—Count Rumrorp’s improved 
~ 
th Accuracy and Dispatch.—Mr. Davis’s hanging Scaffold; and 
» Martix’s Method of relieving a Horse from a Cart when fallen 
mm in its Suafts.— A Quarto Plate to illustrate Mr. J. Hicks’s Ac- 
int of the Situation and Means of raising the Royal George —-A Plate 
Hiustrate Mr. Sournern’s Essay on the Exuilibrium of a Combination 
teams, Blocks, &c. and on the Polygon of Forces.~-A Plate to illustrate 
)Steevens’s Account of a Meteor seen at Londonand other Places in 
ch last.—A Plate to illustrate Mr, Macuury’s Annular Saw. 
fol. XL. A Plate containing Professor Lesuiz’s Atmometer, and 
ures to illustrate Dr. Wottasron’s Paper on the elementary Particles 
ertain Crystals.—A Sketch of that Part of the Islard of Java which 
fains the natural Lake of Sulphuric Acid—Interior of Volcano in the 
id of Java, and Figures to illustrate Mr. Watker’s Paper on the Elec- 
ee-pots.—Mr. Goss’s Instrument to work Addition of Numbers- 
