208 



Apparatus, Supplies and Materials for General Use. 



Xn. ,M 1^1 



B 



51181. 1 2. 



51184. 1:4. 



51193. 1:3. 



51195. 1 : 6. 



51209. 1:6. 



51199. 1:4. 



51201. 1:4. 



51203. 1 -. 3. 



51,181. Thermo-Regulator, Figure, 

 to 50 C. . 



for accurately adjusting within limits of 



20' 



The thermo-regulator is inserted in the apparatus to be heated in such wise that the portion 

 filled with mercury can be completely heated. For transit purposes the tube D is packed by itself, 

 IN place being taken by a wire with bungs of cotton wool, which closes the ascension pipe at a. Before 

 UMIJJ; the regulator this wire is removed and the tube D inserted in such manner that the scale etched 

 on the tube, and corresponding to the desired temperature, is covered by the surface of the metal 

 cap d. 



r>1.182. - - The preceding, for + 20 100 C 



r.1,183. -- idem, for + 20 150 C 



51,184. Bunsen Burner, F i g u r e, can be screwed apart for demonstration purposes, simple 

 pattern, without tap but having air regulator 



51,186. -The preceding, but with tap and air regulator 



51. is?. Accessories for the previous gas burners Nos. 51,184 and 51,186, consisting of 

 Nos. 51,18851,192 



51,188. Chimney, with holder 



r, 1. 1 v.i. Annex for carrying small dishes, watch glasses, <)< 



."i 1. 1 '.tit. Sieve Annex, with numerous apertures above 



r>l.] !H. Crown Piece, with lateral openings, for obtaining a corona of flame 



.~i I. l!i:>. Slit Annex, for obtaining a wide flame 



."> 1.1 '.::. Iserlohn Burner (.Mast.- burner), with double draught channel. Figure 



51, 104. Rabs Burner, with .'< movable tubes 



Cl. - r >4K(l, 11B, f>481, 5478, 



:,177. 



1719, 5482, . r >483, 112. 



