638 



Propagation of Heat. 



Xn. .V. 289 



55 289. 1 : 8. 



55 291. 1 : 3. 



55 292. 1 : 8. 



55 294. 1 : 5. 



55 290. 1 : 5. 



55 293. 1 : 8. 



55 295. 1 : 7. 



Propagation of Heat. 



55,289. Apparatus for demonstrating Thermal Conduction in Metal Rods, after Ingenhouss, 

 Figure (W. D., Fig. 379 [359]; Gan.-Eein., Fig. 390), with rods of copper, brass, 

 zinc, tin, iron and lead, coated with silver mercury iodide 



The paint, having a beautiful yellow colour in the cold state, becomes brown when heated, 

 resuming, however, its yellow colour some time after cooling. 



">, 290. - - idem, with vertical Rules, Figure 



* 55. -Jill. - - idem, smaller, Figure, with 5 rods to which metal rings are stuck on with 

 wax, for lantern projection (Fr. phys. Techn., I, 2, Fig. 3861) .......... 



55,:_'92. Apparatus after Miihlenbein, with Bunsen Burner, Figure, with bars, arranged 



star-shape. of brass, zinc, tin, iron, German silver and wood, painted with silver mercury 

 iodide; they ;m- heated from the centre (Fr. phys. Techn., I, 2, Fii, r . .'5*64) .... 



.V>.293. - - i d e in, with Spirit Burner, cf. Fig. 55,293 (Fr. phys. Techn., I, 2, Fig. 3865) . 



55.294. Apparatus for showing the Conduction of Heat in Metal Rods, F i g u r e, after Rebens- 

 torff, for steam heating (W. I)., p. 568 [527]; Ztschr. f. d. phys. u. ehein. I'.. 21. 1908, 

 p. 297), with rods of copper, brass, zinc, tin, iron and lead, coated on one side with 

 mercury copper iodide (red) and on the other witli mercury silver iodide (yellow) . . 



.".".2 95. Apparatus for demonstrating the different Thermal Conductivity of Copper and Iron, 

 Figure, coated with thermoscopic paint ................... 



01. 6206. 1919, 



* Ciin lie used with the projection ;i)>|i;ini1 us. 



1916, 1918, 



I s. d. 



i. o.o 



1. 2.0 



0. 12. 



1. 10.0 

 1. 10. 



1. I. U 



0. 12. d 



5887, 

 3693, 

 3691. 



