138 SEC. 5. MOLECULAR PHYSICS. 



609. Double Cylinder Air Pump, with Babinet's stop-cock, 

 cylinder 170 mm. high, 60 mm. wide, with manometer and glass 

 plate of 200 mm. diameter, on a mahogany board, with the 

 following auxiliary apparatus : 



1. A pair of Magdeburg hemispheres of glass. 



2. An electric egg, consisting of two parts, with arrangement 

 for carbon points. 



3. A double mill. 



4. Balloon, with bell. 



5. Balloon, for the gravity of the air. 



6. Fountain. 



7. Quicksilver. 



8. King. 



9. Dasimeter. 



10. Falling tube. 



11. Heronsball. 



Warmbrunn, Quilitz, and Co., Berlin. 



610. Apparatus for Lighting, on the system of Dobereiner, 

 with contrivance for drying the gas. 



Warmbrunn, Quilitz, and Co., Berlin. 



610a. Water Vacuum Pump, invented by H. Sprengel in 

 1863. Hermann Sprengel. 



610b. Air Pump, by Handinger, at Ajiessen. 



Chemical Laboratory University of Berlin ; Professor A. 

 W. Hofmann, Director. 



611. Water Pump, either for exhausting or for compressing 

 air. Joseph Conquet. 



This apparatus can be used either iu place of an air-pump, or in place of 

 bellows. Water at a pressure of two atmospheres is required for working it. 



615. Apparatus for Air Pump. Cylinder machine with 

 leather rubbers. The apparatus is so constructed that the cylinder 

 may be enclosed in a large glass receiver, which can be exhausted. 



Museum of King George III., King's College. 



616. Large Air Pump, arranged for effecting the ordinary 

 vacuum or the dry vacuum to a millimetre on the column of mer- 

 cury, and also for producing ice. M. Carre, Paris. 



616a. Small Air Pump, also capable of being transformed 

 at will into a compression pump. M. Carre, Paris. 



617. Apparatus for producing ico by vacuum and sulphuric 

 acid. M. Carre, Paris. 



619. Hydraulic Press of Copper and Glass -(for demon- 

 stration). Luizard, Paris. 



6 2O. Apparatus for Compression. Luizard, Paris. 



