This Day I* published in Svo. with Four Plates by Lowry, 

 Price 16s. Boards, . 



ELEMENTS of ELECTRICITY and ELECTRO-CHEMISTRY, 

 including Galvanism and Voltaic Electricity : with ongiqal 

 xperiments, and a Description of a new System of Electnc.il Insulation. 

 , By GEORGE JOHN SINGER. 



1 Printed for Longman, Hurst, Rees, Orme, and Brown, Paternoster- Row ; 

 ir.d R. Triphook, St. James's-Street. _ 



* * A few Copies are printed on superior Paper, and contain two real 

 Specimens of the Electrical Oxides. Price ll. 10s. extra Boards. These are 

 to be had only at No. 3, Prince's Street, Ca vendish Square. ; 



ENGRAVINGS. 

 Vol XXXIX Mr- Stecvevs's New Levelling-Staff.— A Map illustrating 

 the Great Derbyshire Denudation.— A Quarto Plate to illustrate the Opti- 

 cal Instrument' called the Diacatoptron.- A Plate of Mr. Stebvens s 

 Contrivance for freeing Water-pipes from Air : engraved by Mr. Porter.- 

 Mr. Allan's improved Reflecting Circle.— Mr. Wood s inclosed Gnnd- 

 «tone for Pointing Needles, and Mr. Websteu s Method of carrying oft 

 Steam f'orr, Boilers.— Mr. Bbonton's improved Pump for raising Water 

 while Shafts or Pits are sinking.— Mr. Hodgson's improved Manner , 

 Compass for correcting the Magnetic Variations.— A Quarto co.oured 1 late 

 to illustrate the Geology of Hart of the Vicinity of Dublin. 



Vil XL A Plate to illustrate the Foundation of Mr. W illiam Jonsss 

 temporary Com Rick.— Mr. Stephens's Method of dividing Bricks.— 

 Section of Mr. William Jones's temporary Corn Rick.— Mr. Waistell s 

 Improvement on the Acorn Dibble— A Plate to illustrate Mr. Tawney's 

 New Thrashing Machine.— Two Octavo Plates descriptive of a New Ma- 

 chine for Pumping Water.— Two Plates descriptive of the Muscular Mo- 

 tion of Snakes —Figures to illustrate such Portions of a Sphere as have 

 their Attraction expressed by an algebraic Quantity.— Van Helmont's 

 DifferentialThermometer.— Formation of Ovals tor Gardeners.— Chavasse s 

 Marine Transit.— A Plate to illustrate Mr. Brodie's Experiments on 

 the Influence of the Brain on the Generation of Animal Heat. 



Vol XLI. Pp-pvs's Mercurial Voltaic Conductor.— Leslie s Dif- 

 ferential Thermometer. Diagrams to illustrate Dr. Wollaston's Peri- 

 scopic Camera Obscura and Microscope.— Count Rumford's improved 

 Coffee-pots.— Mr. Goss's Instrument to work Addition of Numbers 

 with Accuracy and Dispatch.— Mr, Davis's hanging Scaffold; and 

 Mr Martin's Method of relieving a Horse from a Cart when fallen 

 Sown in its Shafts.— A Quarto Plate to illustrate Mr. J. Hicks's Ac- 

 count of the Situation and Means of raising the Royal George.— A Plate 

 to illustrate Mr. Southern's Essay on the Equilibrium of a Combination 

 of Beams, Blocks, &c. and on the Polygon of Forces.— A Plate to illustrate 

 M r Sl , Account of a Meteor s'sen at London and other Places in 



h l as t.— A : istrate Mr. Mach ell's- Annular ! 



Vol XLI I. A Plate containing Professor Leslie's Atmometer, and 

 Figure's to illustrate Dr. Wollaston's Paper op the elementary Particles 

 3 ._A Sketch of that Part of the Island of Java which 

 contains the natural Lake of Sulphuric Acid.— Interior of Volcano in,the 

 hlai.-l of Java, and Figures to illustrate Mr. Walker's Paper on the Elec- 

 uid.— A Plate to illustrate M. Link's Memoir on the Anatomy of 

 and Dr. Wollaston's Cryophoros.— A third Plate to illustrate 

 r on the Anatomy ol Plant's.— Mr. T. Jones s Secto- 

 trurnent for dividing right Lines into equal Parts, measur- 

 es, and inscribing Polygons in the Circle, &c— A Plate to illustrate 

 Instrument invented by Sir II. G. Esglevield, Bart. 



