Four gallons.
20. What is the weight of a bushel of oats; or of wheat; and the weight of hay?
40 lbs., or 32.14 lbs. to the cubic foot, in case of oats; 60 lbs. to the bushel, or 48.21 lbs. to the cubic foot, in case of wheat; hay pressed in bundles, weighs 11 lbs. per cubic foot.
21. What weight does an infantry soldier carry when in marching order?
About 45 lbs. in all. His knapsack when packed weighs 24 lbs.; canteen when filled, and one day’s provisions in haversack, 5 lbs.; rifle, musket, sling, and bayonet, 10½ lbs.; belts, complete, including 20 rounds of ammunition, 6 lbs.
22. How is the area of a circle found;
Square the diameter, and multiply by .7854 for the area; or square the circumference, and multiply by .07958 for the same result.
23. How is the content of a conical frustum found?
Add into one sum, the areas of the two ends and the mean proportional between them; take one-third of that sum for the mean area, and multiply it by the perpendicular height of the frustum, for its content.
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