372 MODERN PAPER-MAKING
Example: Find the weight of paper required to produce a web 600 yards
long by 30 inches broad, the paper being the substance of 20x30=^=25 Ib. 500
sheets per ream.
25x(6ooX36)x30 1t
——^-------———=54 Ib.
20x30x50
To find the substance of paper in a web of given length, breadth and weight
in any size of sheet and number of sheets per ream:
Multiply the weight of web by the length, breadth and number of sheets per
ream, and divide result by length of web in inches and breadth of web in inches.
Weight of web x length of sheet x breadth of sheet x No. of sheets per ream
Length of web in inches X breadth of web in inches
Example: Find the weight in 20x30—500 sheets of a web 600 yards long
and 30 inches wide weighing 54 Ib.
54x500x20x30 -,
(6ooX36)x30 ~~
To find the weight of a web of paper:
Multiply width of web in inches by yardage, multiply result by substance
in double crown (20x30) 480 sheets, divide result by 8000 and the result is
the weight of the web in pounds.
Or
Multiply width of web in inches by yardage, multiply result by substance in
demy 480*5 and divide by 5350. The result is the weight of the web in pounds.
To find the cubical contents of any square or rectangular vessel, multiply
the length, breadth and depth together.
Example: Find the number of cubic feet in a tank 6 feet long, 4 feet wide
and 3 feet deep:
6 x 4 x 3=72 cubic feet.
To find the number of gallons a tank will hold, proceed as above and multiply
the result in cubic feet by 6.23 55, this being the number of gallons in i cubic foot.
Extending the above example:
6x4x3x6.2355=448.956 gallons
To find the weight of water in a tank, proceed as above and multiply fhe
number of gallons by 10 (i gallon of distilled water weighs 10 Ib.).
Extending the above example:
6x4x3x6.2355x10=4489.56 Ib.
To find the cubical contents of a cylindrical vessel, square the diameter