ENGRAVI^^GS. 



Vol. XXIV, is embellished with a Plate of Figures to illustrate Mr. Dal- 

 ton's Theory of the Absorption of Gases by Liquids — On the same ;j— also 

 a Refrigeratory for Distillation, acting on the Principle of the Syphon — The 

 Eflects produced by Mr. Ez, Walkbr's newly invented Cometarium — 

 A Quarto Plate illustrative of Experiments by Sir James Hall, Eart., on 

 the Effects of Compression in modifying the Action of Heat — Mr. Stee- 

 VESs's improved Gasometer, for Purposes where uniform Pressure is essen- 

 tial A Plate illustrating Mr. Walker's Paper on the apparent Magnitude 



of the horizontal Moon — A Quarto Plate illustrative of Sir James Hall's 

 Experiments on the Effects of Heat modified by Compression — A Portrait 

 of Mr. Aubert: engraved by Mr. E. Mackenzie — A Quarto Plate of Na- 

 tural History, viz. the Fishes Eremophilus Muiis'ii, Astrobhpus Grixahil, and 

 Pintelodus Cyclopum; and a South American Monkey, the S'lniia Iconina: 

 engraved by Lowry. 



Vol. XXV. contains an Octavo Plate illustrative of Experiments by Sir 

 James Hall on the Effects of Compression in modifyii>g the Action of 



Jjeat A Quarto Plate on the same Subject — A Quarto Plate to illustrate 



Sir James Hall's Paper on the Effects of Heat moditicd b)- Compression 

 —Mr. Salmon's improved Geometrical Qur.drant, Level, and Cakulator, 

 for ascertaining Inaccessible Distances on Land or at Sea.— M. Montgol- 

 fier's new Calorimeter, for determining the comparative Quantities of 

 Ca'otic evolved by the Combustion of dif&rfnt Kinch? of Fuel — Mr. Gil- 

 bert Gilpin's improved Crane with FiesiHe Chains — Mr. Herbert's 

 Bo:)k-case Bolt, and Mr. Le Caan's Check for Carriage Wheels on Rail- 



Hoads Salmon s Improvement on Cana! Locks — Figures to illustrate 



M. Grotthi'jsS Memoir on the Decomposiiion of Water by Galvapism 

 —A Ijjst in Silex, found coated over with Calcedony. 



Vol. XXVI. is illustrated with a Quarto Plate of M. Le Roy's Chrono- 

 meter — Mr. Sylvester's improved Air-Pump — A large Plate relating to 

 Le Roy's Chronometer — An Octavo Plate on the same Subject — The Irish 

 Canal Track-Boat — Mr. Steevens's Autocratic Cock for large Reservoirs — 

 Mr. Woolf's improved Piston for Steam-Engines — Another Plate relating 

 to the same Subject. 



Vol. XXVil. is illustrated with a Quarto Plate of Mr. Steevens's Com- 

 pound Gasometer Mr. Maseres's Fire Escape—-Mr. Walker's new 



Optical Instrument called the Phantasmascnpe- — Mr. Snodgrass's Method 

 of Heating Buildiiigs and Apartments by Means of Steam — Mr. Trotter's 

 Machinery for Curvilinear Sawing, and Mr. Hardie's Improved Book- 

 Jjiuder's Cutting Press — Mr. G bo woe Field's Stove for Heating Rooms, 

 and Drying various Articles — Figures illustrating the Manner of using Mr. 

 Walker's Transit Instrument — Dr. Wollaston's Camera Lucida for 

 drawing from Nature in l^erspcctive. 



Vol. XXVIII. is illustrated with Mr. Kater's Hygrometer — Ramsden's 

 ' Optigraph improved by Mr. Jones— Figures to illustrate Mr. EvAns's 

 Paper on Goniometry — Apparatus employed by Mr. Davy in his new Gal- 

 vanic Experiments — Df.scroizilles' AlkHli-meier; and Figures to illus- 

 trate C. A. Prieur's Experiments on the Decomposition of Light — A 

 Quarto Plate, containing a Skeleton of the Indian Elephant — An Octavo 

 Plate on the same Sutiject — A Quarto Plate of Tables relating to Musical 

 Temperature, by Mr. Farey — Anatomical Figures relating to the Elephant. 

 Vol. XXIX. is embellished with a Portrait of the late Dr. Darwin ) 

 from an original Picture in the Possession of Dr. Thornton — A New Mi- 

 crometer, invented by Mr. Brewster — A Representation of the Comet 

 now visible. — Mr. Field's Plan for Building Towns and Village.': com- 

 posed of Circular Buildings— Mr. Pp.t'ys's New Eudiotnetcr — A Quarta 



