COMPUTATION TABLES. 153 



Size of Tank. 3 ft. 4 ft. 5 ft. 



deep. deep. deep. 



12 by 7 feet 1884.9 2513.2 2141.6 



12 " 8 " 2154.2 2872.3 3590.4 



12 " 9 " 2423.5 3231.3 4039.2 



12 " 10 " 2692.8 3590.4 4488.0 



12 " 11 " 2962.0 3949.4 4936.8 



12 " 12 " 3231.3 4308.4 5385.6 



VIII. Thermometer Scales. 



Fahrenheit. — The freezing-point is taken as the 32d degree 

 of the scale, and 180 degrees are made between that and the 

 boiling-point, which therefore becomes 212°. 



Centigrade or Celsius. — The freezing-point of water is 

 taken as zero, and boiling-i3oint as 100°. 



Reaumur. — The freezing-point of water is taken as zero, 

 the boiling-point as 80°. 



A degree Centigrade is therefore greater than a degree of 

 Fahrenheit as nine is greater than five ; and a degree of Reau- 

 mur is greater, as nine is greater than four. 



To reduce Fahrenheit degrees to Centigrade, subtract 32 from 

 the given degree of Fahrenheit and multiply the remainder by 

 5 and divide it by 9 : {F^ - 32) f . 



To reduce Centigrade to Fahrenheit, multiply the given 

 degree of Centigrade by 9 and divide the product by 5, then to 

 the quotient add 32 : (fC.° -|- 32). 



To reduce Fahrenheit to Reaumur, subtract 32 from the 

 given degree of Fahrenheit and multiply the remainder by 4 

 and divide by 9 : (F.° - 32) f. 



To reduce Reaumur to Fahrenheit, multiply the given degree 

 of Reaumur by 9 and divide by 4, then add 32 : (|R.° -|- 32). 



