MISCELLANEOUS,, 1063 



4536. Sulphuretted Hydrogen Apparatus, according to 

 Kipp, with ground in glass cock. 



4537. Displacement Apparatxis, according to Eobiquet, 

 with funnel provided with ground in glass stopper. 



W. J. Rohrbcck, J. F. Luhme $ Co., Berlin (Dr. ITcrm. 



Rohrbeck). 



Glass wool, very convenient for filtering acids and alkalies in place of as- 

 bestos, much cleaner, and practical. If washed alter use, it can be employed 

 various times. 



Technology. 



4538. Wooden Model of a Blast Furnace. 



4544. Wooden Model for demonstrating the Manu- 

 facture of Sulphuric Acid. 



4545. Wooden Model of a Glass Furnace (Siemens' 

 regenerative system). 



All these wooden models can be conveniently taken asunder, for demon- 

 strating the interior arrangement of the stoves. 



4539. Wooden Model of a Shaft Furnace. 



4540. Wooden Model of a Puddling Furnace. 



4541. Wooden Model of a Holling and Stamping Mill. 



4542. Wooden Model of a Silver-Ore Refining Fur- 

 nace. 



4543. Wooden Model of a Double Boasting-Furnace 

 for Copper. 



W. J. Rohrbeck, J. F. Luhme $ Co., Berlin (Dr. Herm. 

 RohrbecK). 



4546. Apparatus for the graphical demonstration of the 

 Law of Descent. 



4547. Apparatus for determining the Linear Expansion 

 by Heat, by means of reading by mirror reflection. 



4548. Miiller's Wave Disc. 



(a.) Stativ (stand). 



(/>.) Portfolio with stroboscopical discs. 



4549. Some Drawings which Miiller used, in the years 1840 

 and 1850, in his lectures explanatory of apparatus. 



Physical Institute of the University of Freiburg, Baden 

 (Prof. Dr. A. Glaus). 



Glass Models of the Eye (3.) 



Science Schools, South Kensington Museum. 



