This Day is published. in 8vo. with Four Plates by Lowry, 
Price 16s. Boards, 
LEMENTS of ELECTRICITY and ELECTRO-CHEMISTRY, 
including GaLVANISM and Vorraic Execrricity : with original 
eriments, and a Description of a new System of Electrical Insulation. 
By GEORGE JOHN SINGER. 
rinted for Longman, Hurst, Rees, Orme, and Brown, Paternoster-Row ; 
R. Triphook, St. James’s-Strect. 
«* A few Copies are printed on superior Paper, and illustrated with two real 
imens of the Electrical Oxides. Price 1/. 10s. extra Boards. These are 
had only by application to Mr. Sincer, No. 3, Prince’s Street, Caven- 
Square. 
ENGRAVINGS. 
ol. XX XIX. Mr.STEEVENS’s New Levelling-Staff—A Map illustrating 
Great Derbyshire Denudation.—A Quarto Plate to illustrate the Opti- 
Instrument called the Diacatoptron.— A Plate of Mr. SrEEVENs’s 
ntrivance for freeing Water-pipes from Air: engraved by Mr. PorTER.— 
r, ALLan’s improved Reflecting Circle—Mr. Woon’s inclosed Grind- 
e for Pointing Needles, and Mr. WE nstER’s Method of carryin oft 
eam from Boilers.—Mr. Bruxton’s improved Pump for raising Water 
hile Shafts or Pits are sinking.—Mr. Hopcson’s improved Mariner’s 
rrecting the Magnetic Variations. —A Quarto coloured Plate 
illustrate the Geology of Part of the Vicinity of Dublin, 
Vol. XL. A Plate to illustrate the Foundation of Mr. Witt1am Jonas's 
mporary Corn Rick.—Mr. SterHens’s Method of dividing Bricks.— 
ction of Mr. WiLtL1AM Jones's temporary Corn Rick.—Mr. WalsTgLu's 
ine for Pumping Water.—T wo Plates descriptive of the Muscular Mo- 
ion of Snakes.—Figures to illustrate such Portions of a Sphere as have 
heir Attraction expressed by an algebraic Quantity. —VaN Hetmont’s 
e Influence of the Brain on the Generation of Animal Heat. 
Vol. XLI. Perys’s Mercurial Voltaic Conductor.—Lestiz’s Dif- 
ferential Thermometer.. Diagrams to illustrate Dr. Wottasron’s Peri- 
scopic Camera Obscura and Microscope.—-Count Rum FoRD’s improved 
Coffee-pots.—Mr. Goss’s Instrument to work Addition of Numbers 
with Accuracy and Dispatch.—Mr. Davis’s hanging Scaffold; and 
Mr. Martix’s Method of relieving a Horse from a Gart when fallen 
down in its Shafts— A Quarto Plate to illustrate Mr. J. Hicxs’s Ac- 
‘count of the Situation and Means of raising the Royal George.—A Plate 
‘to illustrate Mr. Souru ern’s Essay on the Equilibrium of a Combination 
of Beams, Blocks, &c. and on the Polygon of Forces.—-A Plate to illustrate 
Mr, SteeveENs’s Account of a Meteor seen at London and other Places in 
March last.—A Plate to ‘Hustrate Mr. Macuexu’s Annular Saw. 
Vol. XLII. A Plate containing Professor Lesire’s Atmometer, and 
Figures to illustrate Dr. Wottaston’s Paper on the elementary Particles 
certain Crystals—A Sketch of that Part of the Island of Java which 
eontains the natural Lake of Sulphuric Acid.—Interior of Volcano in the 
Island of Java, and Figures to illustrate Mr. Wakex’s Paper on the Elec- 
tric Fluid.—A Plate to illustrate M. Linx’s Memoir on the Anatomy of 
Plants, and Dr. Wotvasron's Cryophorus.—A third Plate to illustrate 
M. Linx’s Memoir on the Anatomy of Plants.—Mr. T. Jones's Secto- 
h,—a new Instrument for dividing right Lines into equal Parts, measur- 
ing Angles, and inscribing Polygons in the Circle, &c. 
