86 EXAMPLES. 



44. A crystal of salt weighs 6.3 grs. in air ; when covered 

 with wax, the specific gravity of which is .96, the whole 

 weighs 8.22 grs. in air and 3.02 in water. Find the specific 

 gravity of salt. Am. 1.9 nearly. 



45. A Nicholson's Hydrometer weighs 6 ozs., and it is 

 requisite to place weights of 1 oz. and 1| ozs. in the upper 

 cup to sink the instrument to the same point in two differ- 

 ent liquids. Compare the specific gravities of the liquids. 



46. A diamond ring weighs 69 grs., and 64J grs. in 

 water. The specific gravity of gold being 16^, and that of 

 diamond 3, what is the weight of the diamond ? 



Ans. 3 grs. 



47. A body A weighs 10 grs. in water, and a body B 

 weighs 14 grs. in air, and A and B together weigh 7 grs. in 

 water. The specific gravity of air being .0013, required (1) 

 the specific gravity of B, and (2) the number of grs. of 

 water equal to it in volume. 



Ans. (1) .8237; (2) 17.023 grs. 



48. A compound of gold and silver, weighing 10 Ibs., has 

 a specific gravity of 14, that of gold, being 19.3, and that of 

 silver being 10.5. Required the weights of the gold and 

 the silver in the compound. 



Ans. Gold = 5.483 Ibs.; silver = 4.517 Ibs. 



49. A diamond ring weighs 65 grs. in air and 60 in water. 

 Find the weight of the diamond, if the specific gravity of 

 gold is 17.5, and that of the diamond 3. Ans. 6.875 grs. 



50. The crown made for Hiero, King of Syracuse (Art. 

 24, note), with equal weights of gold and silver, were all 

 weighed in water ; the crown lost ^ of its weight, the gold 

 lost -fo of its weight, and the silver lost -fc of its weight. 

 Prove that the gold and silver were mixed in the proportion 

 of 11 : 9. 



