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 7% 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. 














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