ENGRAVINGS. 



Vol. XXXVI. Design for a Cast-Tron Tunnel to cro^s the Thames, 

 by Col. Lennon — Two Plates to illustrate Hauy's Crystallojraphy. — A. 

 Head of Buchanan, from an original Portrait by Titian : engraved by 

 WooLNOTK. — A Plate to illustrate the i'ape- on Musical Intervals. — A 

 Plate \o illustrate Mr. Salmon's Papei on Building in Pise, and his Ma- 

 chine for securing Depredators without injuring thein. — A Plate to Illustrate 

 a Memoir by M. Hassenfratz on the Alterations which the Light of 

 the Sun undergoes in passing through the Atmosphere. — Mr. Spengbr's 

 Camp Telegraph. — Section of Timahoe Bog in Ireland. — A Transverse 

 Section of LuUymore Bog, — part of the Great Bog of Allen.— rBerthollet's 

 Manometer. 



Vol. XXXVII. Plates i and 2, Representations of Luminous Animals, to 

 illustrate Mr.Macartney's Paper on that Subject.— Quarto Plate of the Orbits 

 of the newly discovered Planets. — A Quarto Plate to illustrate M.Pkyr a rd*s 

 Paper on Burning Mirrors. — A Plate to illu«trate Mr. Donovan's Paper 

 on Electro-chemical Agency — Mr. Accum's New Mineralogical Apparatus. 

 — Mr. Lee's Thrashing Machme. — Mr. Cook's Apparatus for making Gas 

 and other Products from Pit-C j.al ; and Mr. Way's Method of procuring 

 Turpentine from Fir Trees. — A Plate to illustrate Dr. Brewster's Paper 

 on the Power of the Lever. 



Vol. XXXVIII. Mr Donkin's Tachometer. — Mr. Allan's Mathematical 

 Dividing Engine. — A 410 Piate ot" Mr, Loeschman's Patent Piano-Forte, 

 and Mr. Liston's Patent Enharmonic Organ. — A Plate to illustrate Mr. 

 Hauy's Paper on the Electricity of Minerals. — .Vir. Walker's improved 

 Micrometer. — Mr. Moult's Filtering Apparatus. — Mr. Smith's Method 

 of relieving a Horse fallen in the Shafts of a loaded Cart. — Mr. Taylor's 

 Air-Exhautter for Mines. — A Representation of the Comet now visible in 

 Ursa Major. — Sir Howard Douglas's Patent Reflecting Semicircle. — 

 A coloured Mjp to illustrate Dr. Campbell's Paper on the inferior Strata 

 of the Earth occurring in Lancashire. — Mr. Sadler's Apparatus for 

 Smelting of Lead. — A Plate to illustrate Mr. William Smith's and Mr, 

 Edwari> Martin's Reports on tlie State of the Collieries at and near Nail- 

 sea, ill Somersetshire. — Mr. Sahler's Apparatus for Smelting of Lead.— 

 A Plate to illustrate the diffcrer.t Theories of Arches or Vaults,and of Domes. 



Vol.XXXlX. Mr.SxEEVENs's New Levelling- Staff. — A Map illustrating 

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

 ral Instrument called the Diacatoptron. — A Plate of Mr. Stekvens's 

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

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

 stone for Pointing Needles, and Mr. Webster's Method of carrying off 

 ;>team from Boilers. — Mr. Bbonton's improved Pump for raisinjr Water 

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

 Compass for correcting the Magnetic Variations. — A Quarto coloured Plate 

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



Vol. XL. A Plate to illustrate the Foundation of Mr. William Jonis's 

 temporaiy C<jrn Rick. — Mr. Stephlns's Method of dividing Bricks. — 

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

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

 New Thrashing Marhiue. — Two Octavo Plates descriptiv* of a New Ma- 

 chine for Pumping Water. 



