308 



Molecular Effects of Solids. 



No. 52 192 



52201. 1:10. 



52 195. 1 



52,192. Apparatus for Determining Young's Modulus, F i gu r e, with the aid of the catheto- 



meter (Chwolson-Pflaum, Lehrb. d. Phys., 1904, Vol. 1, p. 700) 



Rubber, steel and glass are given in as test materials. 



s. d. 

 9. 0.0 





52,193. Apparatus (Spring's), for proving that a peimanent deformation (plasticity) increasing 

 with time takes place when the elastic limit is exceeded, Figure (Fr. phys. Teehn. I. 

 2, Fig. 2254 [I, Fig. 137]) 17.1(1.0 



The apparatus consists of a massive oak frame, an iron T-shaped girder the thicker end of which 

 is curved upwards, and a wrought iron downing-levi r which MTV< s as bearing. The latter is loaded 

 at its free cud with weights, as shown in the Figure, while the point of pressure is as close as possible 

 to the fulcrum. The pressure exerted can be easily calculated from the dimension. The apparatus 

 and a pressure mould, supplied by us, admit of a pressure of 10,000 atmospheres. The necessary 

 weights are included in the priee of the apparatus. 



52,194. 2 Bars for Comparing Torsion of Elasticity, as suggested by Friedr. C. G. Miillcr (M. 

 T., p. 50), with clamping device 



0. 2. 



II IIKM. 



.Mis. 690, 892. 



