18 



A. Hasemann, Berlin C. 



2. A machine for adjusting balances. Fig. 1. This machine 

 was invented in 1875 by H. Hasemann. It automatically adjusts the 

 parallelism of the knife-edges and the equidistance of the points of 



suspension of the charges from the fulcrum. By means of a machine 

 of this description used in the factory since 1882 about 10000 balances 

 have been adjusted. 



3. Drawing and description of: 

 ,,Oscillation of a cylinder upon another cylinder. " 



(Knife-edge upon knife-edge). 

 'A new pendulum suspension by H. Hasemann. 

 The edge of a pendulum becomes, through pressure, reduced to 

 a surface. 



The author has given this inevitably blunt edge a' cylindrical 



form by a suitable grinding 

 machine and placed the 

 knife - edge thus protected 

 from further deterioration 

 upon a surface of similar 

 form. The horizontal pro- 

 jection a b of the travel of 

 C (the fulcrum) upon the 



Fig. 2. 



Fig. 3. 



cylindrical surface of the pendulum is in the case of a plane = r sin a 



