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height; then multiply the sum by the height, and the product by .5236 for the contents. 20. To find how large a cube may be cut from any given sphere, or be inscribed in it.

Rule. Square the diameter of the sphere, divide that product by 3, and extract the square root of the quotient for the answer. 21. To find the number of gallons, &c., in a square vessel.

Rule. Take the dimensions in inches ; then multiply the length, breadth, and height together ; divide the product by 282 for ale gallons, 231 for wine gallons, and 2150.42 for bushels. 22. To find the contents of a cask.

Rule. Take the dimensions of the cask in inches ; viz. the diameter of the bung and head, and the length of the cask. Note the difference between the bung diameter and the head diameter. If the staves of the cask be much curved between the bung and the head, multiply the difference by .7; if not quite so much curved, by .65; if they bulge yet less, by .6; and, if they are almost straight, by .55; add the product to the head diameter ; the sum will be a mean diameter by which the cask is reduced to a cylinder.

Square the mean diameter thus found, then multiply it by the length ; divide the product by 359 for ale or beer gallons, and by 294 for wine gallons. 23. To find the contents of a round vessel, wider at one end than the other.

Rule. Multiply the greater diameter by the less; to this product, add į of the square of their difference, then multiply by the height, and divide as in the last rule. 24. To measure round timber.

Rule. Multiply the length of the stick, taken in feet, by the square of the girt, taken in inches; divide this product by 144, and the quotient is the contents in cubic feet.

Note. The girt is usually taken about the distance from the larger to the smaller end.

1. What are the contents of a board 25 feet long and 3 feet wide ?

Ans. 75 feet. 2. What is the difference between the contents of two

floors ; one is 37 feet long and 27 feet wide, and the other is 40 feet long and 20 feet wide ? Ans. 199 feet. 3. The base of a rhombus is 15 feet, and its perpendicular height is 12 feet ; what are its contents ?

Ans. 180 feet. 4. What are the contents of a triangle, whose base is 24 feet, and whose perpendicular height is 18 feet?

Ans. 216 feet. 5. What are the contents of a triangular piece of land, whose sides are 50 rods, 60 rods, and 70 rods ?

Ans. 1469.69+ rods. 6. What is the circumference of a circle, whose diameter is 50 feet ?

Ans. 157.0796+ feet. 7. We have a round field 40 rods in diameter ; what is

the side of a square field, that will contain the same quantity ?

Ans. 35.44+ rods. 8. What is the side of an equilateral triangle, that may be inscribed in a circle 50 feet in diameter ?

Ans. 35.35+ feet. 9. If the diameter of a circle be 200 feet, what is the

Ans. 31415.92+ feet. 10. What is the diameter of a circle, whose circumference is 80 miles ?

Ans. 25.46+ miles. 11. I have a circular field 100 rods in circumference; what must be the side of a square field, that shall contain the same area ?

Ans. 28.2+ rods. 12. Required the side of a triangle, that may be inscribed in a circle, whose circumference is 1000 feet.

Ans. 275.66+ feet. 13. How large a square field may be inscribed in a circle, whose circumference is 100 rods ?

Ans. 22.5+ rods square. 14. How many cubic feet are there in a cube whose sides are 8 feet ?

Ans. 512 feet. 15. What is the difference between the number of cubic feet in a room 30 feet long, 20 feet wide, and 10 feet

area ?

high, and the number of square feet in the surface of the room?

Ans. 6000 solid feet. 2200 square feet. 16. What are the contents of a triangular prism, whose length is 20 feet, and the three sides of its triangular end or base 5, 4, and 3 feet?

Ans. 120 feet. 17. What are the solid contents of a cone, whose height is 30 feet, and the diameter of its base 5 feet ?

Ans. 196.3+ feet. 18. The largest of the Egyptian pyramids is square at its base, and measures 693 feet on a side. Its height is 500 feet. Now, supposing it to come to a point at its vertex, what are its solid contents, and how many miles in length of wall would it make, 4 feet in height and 2 feet thick ?

Ans. 80,041,500 cubic feet. 1894.9 miles in length. 19. Required the convex surface of a cone, whose side is 50 feet, and the circumference at its base 12 feet.

Ans. 300 feet 20. Required the solid contents of Bunker Hill monument, whose height is 220 feet, and being 30 feet square at its base, and 15 feet square at its vertex.

Ans. 115500 cubic feet. 21. What are the contents of a stick of timber 20 feet long, and the diameter at the larger end 12 inches, and at the smaller end 6 inches ? Ans. 9.163+ feet. 22. What is the solidity of a sphere, whose diameter is 20 inches ?

Ans. 4188.8+ inches. 23. What is the convex surface of a globe, whose diameter is 20 inches ?

Ans. 1256.6+ inches. 24. What are the contents of a spherical segment 3 feet in height, cut from a sphere 10 feet in diameter ?

Ans. 113.0976 feet. 25. What is the solidity of a segment of a sphere, its height being 8 inches; and the diameter of its base 20 inches ?

Ans. 1224.7232 inches. 26. How large a cube may be inscribed in a sphere 10 inches in diameter ?

Ans. 5.773+ inches. 27. How many winę gallons will a cubical box contain, that is 8 feet long, 4 feet high, and 3 feet wide ?

Ans. 718.1+ gallons. 28. How many bushels of grain will a box contain, that is 12 feet long, 5 feet wide, and 4 feet high?

Ans. 192.8+ bushels.

29. What are the contents of a cask, in wine gallons, whose bung diameter is 30 inches, head diameter 24 inches, and length 40 inches ? Ans. 108.19+ gallons. 30. How many cubic feet in a stick of timber, which is 40 feet long, and whose girt is 60 inches ?

Ans. 621 feet.

Section 51.

MISCELLANEOUS QUESTIONS.

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1. What is the difference between 7 pence and 10 cents ?

Ans. £d. 2. What number is that, to which, if be added, the sum will be 71 ?

Ans. 73. 3. What number is that, from which, if 34 be taken, the remainder will be 41 ?

Ans. 733 4. What number is that, to which, if 34 be added, and the sum divided by 54, the quotient will be 5 ?

Ans. 234. 5. From 11 of a mile take ţ of a furlong.

Ans. 4fur. 12rd. 8ft. 8in. 6. From 7 acres take it of a rood.

Ans. 6A. 3R. 7p. 74ft. 36in. 17. John Swift can travel 7 miles in g of an hour, but Thomas Slow can travel only 5 miles in ' of an hour. Both started from Danvers at the same time for Boston, the distance being 12 miles. How much sooner will Swift arrive in Boston than Slow ? Ans. 1236 seconds. 9. If g of a ton cost $49, what cost lcwt. ?

Ans. $ 3.92. 9. How many bricks, 8 inches long, 4 inches wide, and 2 inches thick, will it take to build a wall 40 feet long, 20 feet high, and 2 feet thick ? Ans. 43200 bricks. 10. How many bricks will it take to build the walls of a house, which is 80 feet long, 40 feet wide, and 25 feet high, the wall to be 12 inches thick ; the brick being of the same dimensions, as in the last question ?

Ans. 159300 bricks.

wide,

11. How many tiles, 8 inches square, will cover a floor 18 feet long, and 12 feet wide ? Ans. 486 tiles. 12. If it cost $ 18.25 to carry 11cwt. 3qr. 191bs. 46 miles, how much must be paid for carrying 83cwt. 2qr. 1llbs. 96 miles ?

Åns. $ 267.122047 13. A merchant sold a piece of cloth for $ 24, and thereby lost 25 per cent. ; what would he have gained, had he sold it for $ 34 ?

Ans. 6 per cent. 14. Bought a hogshead of molasses, containing 120 gallons, for $30; but 20 gallons having leaked out, for what must I sell the remainder per gallon to gain $ 10 ?

Ans. $ 0.40. 15. In a piece of land 1173 rods long, and 112; rods

how
many

acres ?

Ans. 82A. IR. 18p. 2yd. 7ft. 133 in. 16. Bought a quantity of goods for $ 128.25, and, having

kept them on hand 6 months, for what must I sell them to gain 6 per cent. ?

Ans. $ 140.02. 17. If 27 bushels of potatoes cost $8.75, what must be paid for 36 bushels ?

Ans. $ 11.66+. 18. How many bushels of oats, at 50 cents per bushel, must I give Moses Webster for 93 bushels of corn, at $ 1.25

per
bushel ?

Ans. 2324 bushels. 19. How many bushels of salt, at $ 1.30 per bushel, must be given in exchange for 75 bushels of wheat, at $ 1.25

Ans. 7236 bushels. 20. If a sportsman spend of his time in smoking, in

“gunning," 2 hours per day in loafing, and 6 hours in eating, drinking, and sleeping, how much remains for useful purposes?

Ans. 2 hours. 21. If a lady spend 1 of her time in sleep, } in making calls, į at her toilet, 7 in reading novels, and 2 hours each day in receiving visits, how large a portion of her time will remain for improving her mind, and domestic employments ?

Ans. 3}} hours per day. 22. What will a piece of land 7f rods long, and 54 rods

wide, come to at $ 25.75 per acre ? Ans. $6.65131 23. If 5% ells English cost $ 15.16, what will 71 yards cost ;

Ans. $ 155.39. 24. If a staff 4 feet long cast a shadow 5 feet, what is the height of that steeple whose shadow is 150 feet ?

Ans. 1077 feet.

per bushel ?

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