AQUARIUM CONSTRUCTION, TOOLS AND APPLIANCES 



SOME AQUARIA DATA 



231 cubic inches of water are a gallon, which weighs 8^ pounds; a 

 cubic foot of water contains 75^ gallons, and 268 gallons weigh a long 

 ton of 2240 pounds. 



The weight in pounds of the water in an aquarium may be' obtained 

 by multiplying the number of gallons by 8^. 



The pressure on the bottom of an aquarium is obtained by multiply- 

 ing the height, in inches, by 0.43, the result being pounds per square 

 inch of bottom; the pressure on the sides by multiplying the length by 

 the breadth, in inches, and this by one-half the pounds pressure per inch 

 on the bottom, obtained as above. The result is the total pressure in 

 pounds. 



The number of gallons in a rectangular aquarium is obtained by 

 multiplying the length, breadth and depth, in inches, and dividing by 

 231. The result is in gallons. Should the sides be sloping, the mean of 

 the upper and lower diameters, (the diameter in the middle,) is taken. 



The capacity of a sphere is obtained by multiplying the cube of the 

 diameter, in inches, by 0.5236 and dividing by 231. The result is in 

 gallons. 



The capacity of a cylinder is obtained by multiplying the square of 

 the radius (one-half the diameter,) in inches, by 3.1415; multiplying this 

 result by the depth, in inches, and dividing by 231. The result is in 

 gallons. 



For ready reference, data is given of the usual sizes of household 

 aquaria. The weights are in pounds, the pressure in pounds per square inch. 



