No. 54 975. 



Kolbe Thermoscope. 



595 



54971. 1:11. 



54 972. 1 : 6. 



54975. 1:10. 



54973,54975,54976. 1:10. 



54,973. Differential and Double Thermoscope after Kolbe, Figure, for experiments on heat 

 and electricity (Ztschr. f. d. phys. u. chem. U. 15, 1902, p. 333; Kolbe, ,,Anleitung zu 

 30 der wichtigsten Schulversuche", see No. 54,974). For making the experiments 

 a suitable selection should be ordered with the apparatus from Nos. 54,975 54,997 . 



In some of the collections of accessories, e. g., in No. 54,995, a few necessary apparatus for the 

 experiments are mentioned at the end, these not being included in the price. These articles must be 

 specially ordered unless already available. 



The Figure Numbers mentioned in the Accessories refer to the Introduction Number 54,974. 



The apparatus consists of a polished wood stand to the back wall of which are fixed two mano- 

 meters having plain scale. The two limbs of the manometers are provided with enlargements and have 

 e?ch at their upper end a stopcock and a funnel-shaped opening for filling. The enlargements have 

 tube attachments HO as to be capable of being connected to receivers by lengths of rubber tubing. 

 The receivers are attached to sliders which can be slipped along a bar, provided with a scale and fixed 

 above the stand. 



Supplied with the apparatus are: 9 sliders, four with long tubes for the receivers, three with 

 medium long tubes for the double screens, two with short tubes for the thermal sources; 1 attachable 

 tube for the sources of heat (box shape); 4 lengths rubber tubing, each 400 mm long; 1 filler (Fig. 2); 

 1 piece cardboard for concealing the second scale; 1 small funnel for flushing the manometer tubes; 

 1 small flask with 100 ccm of aqueous solution of ocetine blue (ready for use); 1 double screen without 

 piece cut out. 



.">4.974. Introduction to 30 of the most important School Experiments with the Kolbe Diffe- 

 rential and Double Thermoscope (48 pages, 34 illustrations) (in German). Gratis and 

 post-free. 



The Figure Numbers mentioned in the following lists of accessories refer to this Introduction. 



54,975. General Accessories for Experiments on Heat, F i g. 54,973 (Fig. 1, Experiments 

 Nus. 116) 



(a) 1 Boiling Flask with rubber bung; 1 Tube with 2 stopcocks; 1 thick walled Rubber Tube 



1 metal stand for the 

 50 cm high (0.6. 0); 



4i> cm long; 1 fork-shaped Glass Tube with 2 short lengths rubber tubing and 1 metal stand for the 

 lioiling flask ( 0. 11. 0); (b) 1 small Stand with spirit lamp and wire gauze globe I 

 (c) 1 (How Lamp with socket, on plate with two terminals ( 0.9.6). 



s. d. 



4. 8. 



1. 6. 



Cl. 6190, 



6195, 6103, .6179. 33* 



