IN NA TOR A L PHIL OSOPHT. 2 J 



above the fountain in the City Hall Park. What is the pres- 

 sure on a single hick of the pipe at the latter point f 



(1000 oz. x 80) * 144 = 34.7 Ibs. 



20. Why does cream rise on milk ? 

 Because it is lighter than the milk. 



21. If a skip founders at sea, to what depth will it sink ? 

 Until its specific gravity becomes equal to that of the water ? 



22. There is a story told of a Chinese boy who accidentally 

 dropped his ball into a deep hole, where he ctfuld not reach it. 

 He filled the hole with water, but the ball would not quite float. 

 He finally bethought himself of a lucky expedient, which was 

 successful. Can you guess it ? 



He put salt in the water. 



23. Which has the greater buoyant force, oil or water? 

 Water, because its density is greater. 



24. What is the weight of '4 cu. ft. of cork ? 



1000 oz. = the weight of 1 en. ft. of water 



.240 = the spec. grav. of cork. 

 240 oz. = the weight of 1 cu. ft. of cork. 

 4 



25. How many oz. of iron will a cubic foot of cork float in 



water ? 



1000 oz. = weight of a cubic foot of water. 

 .240 = ppoc. grav. of cork. 



240 = weight of a cubic foot of cork. 

 1000 oz. 240 oz. = 760 oz., the buoyant force of a cubic foot. 



26. What is the specific gravity of a body whose weight in 

 air is 30 grs. and in water 20 grs. ? 



30 grs. 20 grs. = 10 grs. 



30 grs. -- 10 grs. = 3. 

 The body is three times as heavy as water. 



27. Which is heavier, a pail of fresh water or one of salt- 

 water? 



A pail of salt-water is as much heavier than one of fresh- 

 water as the weight of the salt added to make the brine. 



