552 SEC. 13. CHEMISTRY. 



The total cost of such apparatus composed entirely of platinum, and, there- 

 fore, always of great intrinsic value in comparison with the first outlay, is less 

 than that of any other form yet introduced. 



Briefly the chief advantages of this construction are : 



Great economy in first outlay and daily expense of working. 



Great intrinsic value in a realisable form in proportion to the cost. 



Purity of acid, and freedom from danger. 



2566c. Furnace for Melting Platinum, by Deville's 



method, with top and jets. Johnson, Matthey, and Co. 



Size in which 3,250 ounces troy (about 100 kilos.) is melted in one charge. 



2567. Hofmann's Combustion Furnace. 



Julius Schober, Berlin. 



2568. Bunsen's Combustion Furnace. 



Julius Schober, Berlin. 



2569. Finkener's Combustion Furnace. 



Julius Schobcr, Berlin. 



2570. Hofmann's Table Blowpipe Lamp. 



Julius Schober, Berlin. 



2571. Bunsen's Table Blowpipe Lamp. 



Julius Schobei, Berlin. 



2572. Collection of Gas Lamps of novel Construction. 



(10 Gas lamp provided with one regulator for -air and gas. 



(20 Gas lamp with separate regulator for air. 



(3.) Gas lamp with star support and chimney. 



(4.) Bunsen's gas lamp, single burner. 



(5.) Bunsen's gas lamp, with regulation for air supply. 



(6.) Bunsen's gas lamp, with star support and chimney. 



(7.) Bunsen's gas lamp, consisting of 3 burners. 



) Bunsen's gas lamp, with regulation for air supply. 



'9.) Bunsen's gas lamp, consisting of 6 burners. 



(10.) Bunsen's gas lamp, provided with one regulator for both 

 gas and air. 



(11.) Hofmann's gas lamp. 



(12.) Hofmann's gas lamp, provided with an air regulator, star 

 support, and chimney. 



(13.) Hofmann's gas lamp, with a bent burner tube. 



(14.) Hofmaun's gas lamp, with a bent burner tube, and pro- 

 vided with an air regulator. 



(150 Griffin's rose burner. 



(16.) Griffin's small gas lamp. 



(17.) Griffin's large gas lamp. 



(18.) Microchemical lamp. 



(19.) Iserlohn gas lamp, small size. 



