640 



Propagation of Heat. 



No. ."..". :!04 



55 311. 1 : 3 



55 312. 1 



55.304. Wood Cone for showing the Influence of Direction of Grain, after Eebenstorff 

 Figure, with stand, boiling flask, rubber tubing and glass dish (Ztschr. f. d. phys. 



u. chem. TL, 21, 1908, p. 298) 0.16.0 



55.305. Wire Gauze Cylinder, for demonstrating the safety lamp (M. T., pp. 162/3) ... 0. 1. 



55.306. Davy's Safety Lamp (M. P., Ill, Fig. 457 [II, 2, Fig. 295]) 0. 8.0 



55.307. Wolf's Safety Lamp, Figure, ignited from outside 0. is. n 



In practical use in most German coal-mines. 



55.308. Apparatus after Despretz, for showing Decrease of Temperature with distance from 

 Thermal Source (M. P., II, 2, Fig. 297), with 7 thermometers 3. 4. o 



55.309. -- idem, with 5 thermometers, Figure 2. 1 1. 



* 55,310. - - idem, with 3 thermometers 2. 8. 



55.311. -- idem, smaller, for objective demonstration, with 3 thermometers, Figure, o. H'>. 



55.312. Apparatus after Dcspict/.. for showing Decrease of Temperature with distance from 

 Thermal Source (M. P., Ill, Fig. 459 [II, 2, Fig. 297]; (Ian. -.Man.. Fig. 535; Gan.-Kcin.. 



Fig. 391), the rod being heated by oil or water bath. Figure, with 7 thermometers 3.12.0 



V>.313. -- idem, with 5 thermometers 3. <>. 



V),314. -- idem, with 3 thermometers 2.14.0 



55,315. Apparatus for investigating the Thermal Conduction of Liquids, Figure, gla>> 

 eylim'er with differential thermosenpe and vessel for placing above this to contain the 

 heated liquid (Gan.-Kein., Fig. 393) ; 1. o. () 



* Can ! used with projection apparatus. ri. 1920. .-,"77. MUI. 



-' 



