306 



Molecular Effects of Solids. 



X.i. :.L'184 



52184. 1:10. 



52185. 1:10. 



52 186 A. 1:12. 52 186 B. 1 :12. 



52 187. 1 : 13. 



52.184. Model for Demonstrating Mohr's Law on the Elastic Line, as suggested by Prof. s <i. 

 Eugen Meyer, Figure (Ztschr. d. V. d. I. 53, 1909, pp. 1301 et seq., No. 8, Fig. L>7. 



and text-sheet 14, Fig. 26) 5.10.0 



The bar resting freely on bearings at the points a and b, loaded with the weight P, assumes the 

 same elastic line as the chain carried over the same bearing, since its horizontal tension is equal to 



the modulus of elasticity, and as the line of load of the chain is equal to the line of the -- deter-. 



J 

 mined for the bar. 



52.185. Rivetting Model, Prof. Eugen Meyer's, Figure, for explaining the strain on the 

 chord rivets and the shearing stress in compound girders which are submitted to a 

 bending strain (Ztschr. d. V. d. I. 53, 1909, pp. 1301 et seq., No. 9, Figs. 31 and 32, and 

 text-sheet 14, Figs. 28 30) 5. 5.0 



The rivet submitted to the different stresses can be taken out and it is possible that the shearing 

 or compressive stress present in the cross sections ee, ff, and which the rivet must take up can be 

 ascertained by a lateral movement of the angle iron with the chord piece opposite the web sheet. In 

 like manner the shearing force present in the section gg can be shown by loosening the connection. 



52.186. Breaking Model (Bach's), Figs. A and B (Ztschr. d. V. d. I. 53, 1909, pp. 1301 et 

 seq., No. 10, and text-sheet 14, Figs. 33 and 34), for showing that the resistance to 

 breaking strain is inversely proportional to the square of the length of the bar ... 1. 15. 



On loading the bars, which are gripped vertically, stable equilibrium occurs between the bending 

 moment of the load and the elastic forces, either when the bars are in an extended or a curved posi- 

 tion; or when the load is considerable a condition of equilibrium does not take place and 

 the wood bars are fractured. Test bars are given in with the apparatus, these comprising bars of 

 various material in lengths of 30 and 60 cm. 



52.187. Apparatus for Demonstrating Resistance to Breaking Strain of Bars, as suggested by 



Prof. Michel, Figure 8. 0.0 



With this apparatus the resistance to breaking strain of bars of different lengths, varying section, 

 and of different materials can be determined and the bars can be gripped 'either on one side, or both 

 nds can be left free and be guided in the original axis or both ends can be gripped and guided in the 

 original axis. 



52,187 a. idem, with automatic supply of the load 1 10. 10. 





Complete description of Prof. Eugen Meyer's models on application. 



Cl. 5654, 



