ENGRAVINGS. 



Vol. II. is iUuftrated with Engravings of the following Sub- 

 jects : — Mr. Keith's new invented Thermometer, which marks the 

 greatcft and leaft Degree of Heat from one Time of Obferration 

 to another, and regilters its own Height at every Inftant — 'Mr. 

 Keith's new Barometer, which marks the Rife and Fall of the 

 Mercury from two different Times of Obfervation — Mr. Brown's 

 improved German Key for extracting Teeth — M. Van Marum's 

 Gazometer and Apparatus for producing Water by the Com- 

 buftion of Hydrogen Gas in Oxygen Gas — the Dftiiggctai or Equus 

 Hemionus of the Eallern Dtferts of Middle Afia — the Canis Grains 

 Hibernicus, or Irifli Wolf Dog— the Apparatus employed by the 

 Society for Philofopbical Experiments and Cowverfutions, for combin- 

 ing Hydrogen and Oxygen to form Water — Apparatus employed 

 by Mr. W. Wood, F.L.S. to illuftrate the Permeability gf Glafs to 

 tke Eleftric Fluid — the Apparatus employed by Mr. Varley for 

 hardening and tempering Steel — the Planet Saturn, with his Ring, 

 and two innermoft Satellites, as feen by Dr. Schrbter at Lilienthaf 

 —Mr. Rupp's Apparatus for faturating Water with oxygenated 

 muiiatic Acid, for the Purpofes of Bleaching, without the Addi- 

 tion of Alkali — Reprefentation of a Pearly Excrefcence — Mr. Cuth- 

 bcrtfon's Apparatus for combining Hydrogen and Oxygen to form 

 Water— the Apparatus employed by Count Rumford in his Expe- 

 riments on the Propagation of Heat in Flqids — A Plate illullrating 

 C. Hauy's new Method of expreiling Cryftalline Forms by (hort 

 Signs — Mr. Jet's new-irnproved Mangle — The InRrument employed 

 by the Hindoos for making Incifions in the Poppy to extraft Opium. 



Vol. III. is illuftrated with an Engraving of Mr. Klingert's new 

 Diving Machine, by which a Perfon may dcfcend a c^nfiderable 

 .Depth In Water, and move, walk, and work as if on dry Land ; the 

 Apparatus employed by MefTrs. Pepys an '. AUe^i in Freezing Fifty- 

 fix Pounds of Mercury by Artrficial Cold ; and for Freezing Acids, 

 &c. The Apparatus propofed to be added to Mr. Klingert's Diving 

 Machine, to render it more.cxtenfively ufcful — Captain Bolton's 

 Machine for drawing Bolts in and ouc of Ships — Cit. Guyton's 

 Eudiometer ; the improved Machine for Cutting Chaff, invented 

 by Mr. Robert Salmon, of Wobiirn, Bedfordfliire, for which a 

 Bounty was voted to him by the Society for the Encouragement 

 of Arts, &c. — The new Machine Invented apd employed by the 

 late Mr. Cuflancc to make his unrivalled Vegetable Cuttings for 

 the Microfcope ; drawn &ad engraved from the Machine itfelf, now 

 in the poflefTion of Dr. Thornton ) a Plate «^^o explain the Method 

 of forming lignres with Snnd on Vibrating Surfaces, according 

 t© Dr. Chladni's Theory — The Furnace employed by the French 

 Chemills in their Examination of C. Clout'.'s Proccfs for the im- 

 mediate Converfion of Iron into Caft Steel by means of Carbonat 

 of Lime j and the New Steel-Yard invented by C. Paul of Geneva. 



Number XIII. is illuftrated with a Plate of F'g'Jres to explain 

 Volta's Theory of Galvanlfm — Apparatus erpployed by Dr. Van 

 Marum for the Combuflion of Phofphorus in Oxygen Gas. 



