engravings; 



Vol. IV. is illustrated with a Plate of Figures to explain Volta's 

 Theory of Galvanifm-— Apparatus employed by Dr. Van Marum 

 for the Combuflion of Phofphorus in Oxygen Gas — A 4to Plate 

 relative to the Stru&ure of the Cryftals of Oxyde of Tin — A Plate; 

 filuftrating the beft Conflruftion of the Vanes of Windmills, as far 

 as concerns the Angle of Weather — Mr. Mufhet's Pyrometer for 

 eicertainisgthe Heat of an Ailay-furnace — Von Hauch's New Dfif- 

 charging Electrometer, laid before the Royal Society of Copea- 

 hagen — Humboldt's Portable Barometer for Travellers — A Plate of 

 the comparative Height of the Mountains of Venus, the Earth, 

 and the Moon; according to the Obfervations of M. Schroetbr 

 of Lilipnthal— C. Regnier's New Powder-proof for afcertaining 

 the comparative Strength of Gunpowder — And a microfcopic re- 

 prefentation of certain, Animalcnls found on the Surface ot ft Fife* 

 pond in Norway, which gave it a Red Appearance. 



Vc!. V. is illuilrated with a Reprefentation of a Blaft-Furnace 

 for the Reduction of Iron from the Ore in the large way ^f Ma- 

 nufacture ; from a Drawing by Mr. Mushet — the Apparaus em- 

 ployed by the French Cherhills in their Experiments on tie De- 

 flagration of the Diamond ; and alfo that ufed in the Procuction 

 of Caft Steel from Ir<»n by Means of the Diamond — a QuartoPlate 

 of a New Mercurial Gazometer, invented by Mr. W. H. Iepys 

 jun. — Mr. Howard's Improved Air-Furnace-- a Quarto aid an 

 Octavo Plate, containing Representations of Mr. Burns's nev In- 

 vention, whereby Apartments may be more effectually heated han 

 by the Methods now in ufe ; and the Accidents which fo fre- 

 quently occur, of Women's and Children's Clothes being fet on 

 Fire by Sparks from the Grate, may be prevented — A Chan to 

 fllullrate Mr. Nugent's new Magnetic Theory — Mr. Soim's 

 Ventilator for preferring Corn on Ship-board — Mr. Davis's Por- 

 able Machine for loading and unloading Goods. 



Vol. VI. is illilflrated with a Reprefentation of a remarkable 

 Electric Phenomenon obfervi.d in a Thv.ndei -Cloud — Americas 

 Elks — An improved 40 Gallon Slil!, wluch may be charged and 

 emptied upwards of Seventy Times in 24 Hours— An Improved 

 Still, which, even on a large Scale, may be charged and run off 

 Tour Hundred and Eighty Times every Twenty-four Hoars — The 

 Urceola Elaltica, or Caout-chouc Vine of Sumatra and PuKo- 

 pinang — Mr. Rodman's newly invented Trepanning Inftrumcnt-— 

 Mr. Collier's Filtering Machines — The Mus Burfarius — A Plate 

 flluflrating certain Phenomena obferved in the Air- Vault of the 

 Furnaces of the Devon Iron-Works — Au Air and a Water-Vault 

 for equalifing the Difcharge of Air into a Blafl-Furnace. 



Vol. VII. '$ illuilrated with a Plate illuflrating an unufual hori- 

 zontal Refraction of the Air — Apparatus employed by Mr. 

 Howard for trying the Effects of fulminating Mercury— Plate to 

 explain tht Theory of the -Evening and Morning Dew— -Vefpertilio 

 PUcatofr— Mercurial Ah-holder aud .Breathing Machine— Improved 



