for meafuring the Specific Gravity of Bodies, 39I 



The other dimenfions may be had from the 

 drawing, which is 4 of the linear magnitude of 

 the inftrument itfelf. 



In the conftrudion, it is afliimed that the 

 upper fcale (hall conftantly carry 1000 grains 

 when the lower fcale is empty, and the inftru- 

 ment funk in diftilled water at the temperature 

 of 60? Fahrenheit, to the middle of the wire or 

 ftem. The length of the ftem is arbitrary, as 

 is likewife the diftance of the lower fcale from 

 the furface of the globe. But the length of the 

 ftem being fettled, the lower fcale may be made 

 lighter, and, confequently, the globe lefs, the 

 greater its diftance is taken from the furface of 

 the globe; and the contrary. It is to be noted 

 that the diameter of each fcale muft not be lefs 

 than the fide of a cube of water weighing 

 1000 grains. 



The diftances of the upper and lower fcales, 

 refpeflively. from the neareft furface of the globe 

 being fettled, add half the fide of a cube of 

 water weighing 1000 grains to the diftance of 

 the upper fcale. This increafed diftance, and 

 the faid diftance of the lower fcale, may be con- 

 fidered as the two arms of a lever j and, by the 

 ■property of that mechanical power. 



As the number exprefHng the lower diftance 



Is to the whole weight above; namely 1000 

 grains added to the weight of the upper fcale, 



C c 4 So 



