No. M .v.i I. 



Demonstration and Hydrostatic Balances. 



239 



51590. 1:5. 



51593. 1:11. 



51 592. 1 : 5. 



51594. 1 



The beam has two pointers and the pillar two scales, one of each of these facing the lecturer s. d. 

 and the other the audience. 



The following instructive experiments, amongst others, may be carried out with the balance: 



(a) Equal and unequal arm balance with long pointer; 



(b) Weighing with the rider scale; 



(c) Equal arm balance with short pointer; 



(d) Lengthening a lever arm; 



(e) Shifting the line of axis above or below; 



(f) Hydrostatic balance. 



Outfit for Hydrostatic Experiments : see No. 51,592. 



51,594. New Demonstration Balance (Buff's) (W. & E. phys. Prakt., Fig. 29) ...... 2. 10. 



(1) The knife edges carrying the pans can be brought into the same plane as the central knife 

 edge or be removed from the latter. (2) The centre of gravity of the beam can be displaced, and (3) the 

 length of the arms of the beam can be varied. 



ci. ;..>.').!. 211. 



210, 3791. 



