644 



Thermal Conduction, etc. 



No. 55 342 



55 350 A (55 351, 55.352, 55 353, 55 354, 55 355, 55 356a, 55 358, 55 361). 1 : 8. 



55 342. 1 : 2. 



55 343. 1 : 2. 



55 345. 3 : 10. 



55 349. 1 : 4. 



s. d. 

 0. 1.9 



* 55,342. Small Flat Flask for filling with Carbon Bisulphide and Iodine, Figure, for showing 



the Dark Kays (W. D., Fig. 370 [350]), without charging material, in sheet metal flask 



The small flask is supplied with a larger sheet iron flask in which it, is kept, after filling, pro- 

 tected from light or fire. The flask cannot be delivered filled and is therefore provided with stopper. 

 Filling must not be done near an open flame; even a glowing cigar should be avoided. 



* 55,343. Spherical Flask, Figure, working as Burning Glass for Dark Bays (W. D., Fig. 371 



[351]), in mount, for filling with iodine and carbon bisulphide, with Tinder Holder, 

 uncharged, in sheet iron bottle 0. 8. 



With sunlight or an arc lamp the flask acts as a burning glass und ignites the tinder. Kindly 

 observe the remarks to preceding item. 



55,343 a. 1 Silvered and 1 blackened Glass Flask, for showing the dependence of absorption 

 and emission of heat on the nature of the surface (M. T., p. 164) 



(). 0.0 



Can be used with the projection apparatus. 



Cl. 1937, 



1933. 1934.370, 1936. 



