ENGRAVINGS. 



Vol. XVIII. is illustrated with a Head of the late John Dor,- 

 LOND, F.R.S. Inventor of the Achromatic Telescope: engraved 

 by Mackenzie from an original Portrait in the Possession of the 

 Family — A new Fish called the Bichir, found in the Nile: en- 

 graved by Lowry — A quarto Plate containing Plans ami Repre- 

 sentations of the Buildin.Ts and r\pparatus employed by Mr. J.C. 

 CuRWEN in Steaming Potatoes for the Use of Cattle — The Rev. 

 Michael Ward's Method of adjusting Hadley's Sextant, so as 

 to take Back as correctly as Fore Observations ; and to measure 

 -Angles of 150, \6:, or 17:; Degrees, as accurately as Angles of 

 30, 40, or 50 Degrees — A Quarto Plate containing an accurate 

 Representation of Mr. Robert Hall's Expanding Crane— Mr. 

 Georg. Ru.^sel's improved Water Bucket for drawing Water 

 from deep Wells— A Plate containing improvements made in 

 Clock-work, by Mr. Massuy — Another Plate on the same Subject. 



Vol. XIX. is illustrated with a I>ikeness of the Princess Dash- 

 KOFF, lately Directress of the Imperial Academy of Sciences at 

 St. Petersbiirgh — Mr. Bowler's imi)roved Churn — The Orbits of 

 the two new Planets, by Lalande — M. Tingry's Furnace for 



dissolving Copal for the Purpose of miking Varnish Mr. 



V/right's Apparatus to prevent Conduit Pipes from being 

 burst by Water Freezing in them — Mr. Hualy's Method of cutting 

 Screws in the common Purning I.athe — A Portrait of M. Dela- 

 METHEKiE, Editor of the Juurnal de Physique — Figures to illus- 

 trate a Paper on the Mensuration of Timber, by Mr. Farey — 

 Representations of some curious Ornitholites found af^^estena Nova. 

 — Skeleton of the one-horned Rhinoceros. — Diagrams to illustrate 

 a Paper on the Velocity of calorific Rays emitted by the Sun. 



Volume XX. is illustrated with a Quarto Plate to illustrate the 

 Anatomy of the Rhinoceros — A Quarto Plate of an improved Malt 

 Kiln — An Astronomical Chart, exhibiting the Path of the new 

 Planet — A Quarto Plate of Fossil Teeth of the Rhinocero? : en- 

 graved by Lee — A Plate relating to the Principles of Pump-work : 

 engraved by Lowry — Mr. Knight's improved Woulf's Appa- 

 ratus — A Quarto Plate to illustrate Mr. Martin's Paper on the 

 Principles of Pump- Work — Mr. Steevf.ns's Instrument for 

 equalizing the Efflux and Pressure of non-elastic Fluids— A View 

 of a Water-Spout, taken from Nature. 



Vol. XXI. is illustrated with a Portrait of Dr. Hutton; en- 

 graved by Knight, from a Likeness painted by Miss ByrNe — 

 The Pcranielcs n.i^uta; engraved by Lowi<.Y— -The Ptramelfs o\f 

 sula; also engraved by Lowky. 



