PRINCIPLE OF AfcCHIMKDKS 



canister in the water, and gradually put shot into it until it 

 just sinks in the water when the cover is on. Pour the water 

 displaced by the canister into a beaker counterpoised upon a 

 balance ; then take out the canister, wipe it, and place it in 

 the other pan of the balance. You will rind that the weight of 

 the canister is practically the same as the weight of the water 

 displaced. 



EXPT. 80. Repeat the preceding experiment, using another 

 liquid, such as methylated spirit or turpentine instead of 

 water. 



The foregoing experiments justify the following conclusion 

 known as the "Principle of Archimedes" : When a body is 

 submerged in a liquid it loses weight equal to the weight 

 of the liquid displaced by it. This principle applies to all 

 bodies, whether they are lighter or heavier than the liquid in 

 which they are immersed. 



S( > far we have only referred to bodies which sink, or remain 

 suspended, in the liquids displaced, and it is now necessary to 

 deal with bodies which float. 



Experiments on Flotation. EXPT. 81. Procure a rect- 

 angular rod of wood or a pencil, and weigh it. Select a narrow 



FIG. 42. Flotation of Wooden Hod in a Burette and in a Graduated Jar. 



glass jar graduated into cubic centimetres, or a burette ; till 

 it with water up to a certain mark, and put the rod into it. 



