No. 54 806. 



Thermal Expansion. 



569 



54 803. 1 : 6. 



54 805. 1 : 6. 



54 806. 1:11. 



54.802. Pyrometer with 2 Pointers, F i u r e, for comparing the expansion of tw > bars of 

 iron and zinc 



54.803. Pyrometer, steam heated, F i g u r e, with tubes of brass, copper and iron . . . 



51,285. Small Weinhold Steam Boiler, Fig. 51,285, p. 213 (W. D. Pig. 49 [45]), for producing steam at boiling 

 temperature and higher, of sheet brass 



54,804. i d e ni, with tripod 



s. d. 

 2.10.0 



1.16.0 



0. 16. 



1. 3. 



5.10.0 



54.805. Drum Pyrometer, F i g u r e, with thermometer and spirit lamp (Fr. phys. Techn. I. 

 2, Fig. 2994) 



The six bars of copper, brass, iron, zinc, aluminium and German silver respectively, contained 

 in a water bath, can be successively rotated under a "feeler lever". The bars are adjustable by 

 micrometer screws. The indicating mechanism is very sensitive, the scale peimitting of reading direct 

 to '/no mm - The box has a lateral copper tube for heating and a stirring device. 



54.806. Apparatus for measuring the linear Expansion of Rigid Bodies, after Weinhold. 

 Figure (W. D. Fig. 334 [315]), for objective demonstration, with three lubes of brass, 

 iron, and glass respectively, the tubes heated by steam direct reading on glass 



scale f 2. 10. 



53,195. Drawn Brass Tube, after Eebenstoiff, for thermal expansion in large dimensions (Ztschr. 

 f. d. phys. u. chem. U. 20, 1907, p. 248), also for conserving the acoustic intensity 

 without lateral expansion (Ztschr. f. d. phys. u. chem. U. 19, 1906, p. 279); total length 

 4 m, 20 mm wide, in two parts, for steam-heating in the heat experiment 0. 10. 



* Can be used with the Projection Apparatus. 



Cl. 6143, 6141, 

 6178. 



