V. MASS. 85 



The practical employment and use of the apparatus for scientific and 

 technical industries, in the first instance, and next for the solution of national- 

 economical problems, will be demonstrated by two continuous memoirs, 

 published by the Imperial German Commission on Normal Weights and 

 Measures. 



381a. Corn Balance, in box for showing the per-centage 

 in value of corn by weight as a means of fixing the price for pur- 

 chase or sale. L. Casella. 



382. Model of a Centesimal Weighing Machine, with 

 glass platform. Dr. Kohlmann, Halle. 



384. Model of a Decimal Weighing Machine, with glass 

 platform. 



Physical Institute of the University of Halle (Prof. 

 Knoblauch, Director). 



386. Beam Balance with equal arms, sensibility 1 : 200,000. 

 Kleemann, Mechanical Engineer, Halle. 



390. Beam Balance, for educational purposes. 



Alex. Bernstein and Co., Berlin. 



The beam, for educational purposes, has contrivances for demonstrating 

 the different peculiarities of a scales-beam, or balance, namely, displacement 

 of the centre of gravity, lifting and grinding of the principal bearings, unequal 

 lengths of levers, non- parallelism of the knife edges, and position of one ter- 

 minal knife edge out of the level of the two other knife edges. 



388. Small Decimal Balance, for educational purposes. 



Alex. Bernstein and Co., Berlin. 



The decimal balance for instruction in schools has on each prism a scale, 

 so that the influence of the weight on each prism can be shown by itself. 



389. Analytical Balance. 



Alex. Bernstein and Co., Berlin. 



This analytical balance is capable of carrying 500 grammes, and when 

 fully weighted has a sensitiveness of -^ mgr. ; it has a perforated gilded 

 brass beam with axes of agate and pans with arrangement for releasing all 

 knife-edges, stop balance with pencil, and riders. 



389a. New Balance for a Laboratory, carrying three 

 kilogrammes in each pan, and turning with five milligrammes. 



Dcleuil, Paris. 



When it is not in use, the beam is supported free of the knife edge, as in 

 other accurate balances ; vessels 25 centimetres in diameter can be placed on 

 the pans, also vessels with long necks, and flasks of 1-2 litres capacity. By 

 the aid of the second pan, the specific gravity of very bulky bodies can be 

 obtained. 



389b. Balance in mahogany case. 



Universitdts Laboratorium, Berlin, 



