IV. LABORATORY APPARATUS. 637 



3. Bunsen burner of 8 millimetres. 



4. Three tye-pieees for gas burners. 



5. Treble Bunsen burner. 



6. Wiesnegg burner, with stand. 



7. Berzelius burner, for gas and air. 



8. Stove "& couronne," No. 1. 



9. Do. do. No. 2. 



12. Laboratory blow-pipe, for petroleum. 



13. Bellows, with handle and treddle. 



14. Leclerc oven. 



15. Cloe's universal stand, with hook. 



16. A hand blow-pipe. 



17. Complete Schloesing blow-pipe. 



18. Two Schloesiug ovens, No. 1. 



19. One do. No. 2. 



20. Tube oven, and model of oven for melting platinum. 



21. Perrot apparatus, No. 1. 



22. Clothing framework of Perrot apparatus. 



23. Perrot apparatus, No. 2. 



24. Perrot coppel, No. 5, with treble clothing. 



25. Oxygen retort. 



26. Complete oxygen bladder. 



27. Two Perrot cocks and light strikers combined. 

 28. does " etuve." 



29. Ranvier " etuve." 



30. Wiesnegg " etuve." 



31. Fremy "etuve." 



32. Two gridirons for analysis (18 and 14 burners). 



33. Stove " a couronne," No. 1, for petroleum. 



34. Stove " a couronne," No. 2, for petroleum. 



35. Gas stove for incineration, with two jackets. 



36. ? Candelabra for lecture theatre. 



37. Complete still. 



38. Perrot burner, No. (?), for petroleum. 



39. 150 burners of various sorts, copper. 



40. Pressure and gas caoutchouc. 



41. Twelve Wiesnegg briquettes, No. 2, and 8 quarter briquettes. 



42. Twenty Wiesnegg briquettes, No. 1 (?), and 8 quarter briquettes. 



43. Eight Perrot plots. 



44. Twelve manometer glasses. 



45. A small ingot mould and a large one. 



46. Two charcoal and crucible tongs. 



2524. Laboratory Forge, with double draught, fitted with a 

 cerfeu for the fusion of metals. 



With this forge the pressure can be increased by reducing the quantity of 

 air when soldering is required, either with gas, or with Sainte Claire 

 Deville's forge lamp, or with Schlosing's blow-pipe. 



256O. Apparatus for producing a Blast of Air by the fall of 

 water. (Catalonian " Trompa ".) Dr. Otto Bach, Leipzig. 



Founded on the principle of the hydraulic ram, with the sole difference that 

 the caoutchouc bag (or conduit) takes the place of the valve. It is especially 

 fitted for the use of glassblowers on account of its quiet and perfectly uniform 

 blast of air, and by the introduction of Bunsen valves (ventiles) it can be 



