The ounce is considered as 16 drams. The Avoirdupois pound contains 7000 grains. A hundred-weight is sometimes called a Cental. 135. Troy Weight is used in weighing gold, silver, and jewels. TABLE. = 1 pound, = 136. Apothecaries' Weight is used by druggists and physicians in weighing medicines that are not liquid. 12 ounces = 1 pound, lb. or ib. 1 lb. = 12 oz. = 96 dr. 288 sc. = 5760 gr. = The Civil Day begins and ends at midnight. The exact time in which the earth makes one revolution of the sun is 365 da. 5 hr. 48 min. 49.7 sec., or 365 days, nearly. For convenience the common year is regarded as 365 days; the fraction being disregarded until it amounts to a full day, which is in four years, nearly. Accordingly every fourth year contains 366 days. This day is added to the shortest month, February, and the year in which it is added is called Leap Year. But 365 days is a little more than the exact year, and we have added a little too much, when we have added 1 day to every fourth year, therefore only every fourth centennial year is considered as leap year. This nearly corrects the excess, so that the error is less than 1 day in about 3600 years. Every year divisible by 4, and every centennial year divisible by 400, is a Leap Year. Circular or Angular Measure. 138. A Circle is a plane figure bounded by a curved line, every point of which is equally distant from the centre. 142. A straight line from the centre to the circumference is the radius; as, E to D, or E to C. 143. The circumference of every circle is divided into 360 equal parts called Degrees, each degree into 60 parts called Minutes, and each minute into 60 parts called Seconds. The 144. An Angle is the difference in direction between two straight lines. The point of meeting is the Vertex. vertex is at the centre of a circle, and the angle is measured in degrees by the arc between its sides. Thus B D is the NOTE. An arc of 90 degrees or of a circumference is called a quadrant. A degree upon a great circle of the earth is 69.16 statute miles, or 60 geographical miles. A sign is an arc of 30 degrees. 146. Federal Money is the currency of the United States. The gold coins of the United States are the double-eagle, eagle, half-eagle, quarter-eagle, and one-dollar piece. The silver coins are the dollar, half-dollar, quarter-dollar, and the ten-cent piece. The five-cent piece is nickel, and the one-cent piece bronze. 147. English or Sterling Money. The coin which represents the Pound Sterling is the Sovereign, equal in value to $4.8665. 150. 1. Reduce 5 lb. 6 oz. 12 pwt. 6 gr. to grains. 5 lb. 6 oz. 12 pwt. 6 gr. Since there are 12 oz. in 1 lb., in 5 lb. there are 5 times 12 oz. = 60 oz. (add 6 oz.) = 66 oz. = Since there are 20 pwt. in 1 oz., in 66 oz. there are 66 times 20 pwt. = 1320 pwt. (add 12 pwt.) = 1332 pwt. Since there are 24 gr. there are 1332 times 24 gr. 12 60 6 66 oz. 20 1320 12 1332 pwt. = 24 5328 2664 31968 6 31974 gr. 6. 4 A. 15 = 31974 gr. Reduce to lower denominations : 2. 17 yd. 2 ft. 9 in. to inches. 4. 3 mi. 75 rd. 4 ft. to inches. 5. 16 A. 140 sq. rd. 26 sq. yd. to square yards. 7. 50 ch. 45 li. to links. 8. 16 cu. yd. 25 cu. ft. 900 cu. in. to cubic inches. 9. 8 cd. 12 cu. ft. to cubic feet. 10. 15 gal. 3 qt. 1 pt. to pints. 11. 4 0.6 f. 33 f. 3 25 m to minims. 12. 7 bu. 3 pk. 5 qt. 1 pt. to pints. 13. 16 bu. to quarts. 14. 25 lb. 5 oz. 16 pwt. 10 gr. to grains. 15. 2 T. 6 cwt. 10 lb. 14 oz. to ounces. 16. 16 lb. 5 3 4 3 2 11 gr. to grains. 17. 28° 14' 18" to seconds. 18. £18 15s. 8d. 3 far. to farthings. 19. 27 da. 18 h. 49 min. to seconds. 20. 3 wk. 48 min. 52 sec. to seconds. 21. How many quires in a bundle of paper? 22. How many pints in a cask of molasses holding 84 gallons? 23. How many articles in 7 G. gr. 5 gr.? 24. How many hours in 10 years, allowing for two leap years? 25. How many inches in 4 rods? 26. What is the cost of 10 miles of telephone wire at 28 cents a pound, if a pound measures 75 ft.? 27. Find the number of square inches in a square yard; square feet in a square chain; cubic inches in a cubic yard. 28. How many hours in the month of February, 1896 ? 29. How many cubic inches in 5 gallons. 30. How many square yards in 4 sq. miles? 31. How many square feet in 21 acres? 32. How many ounces in 3 lb. of silver? 3 lb. of iron? 33. If I buy 3 bu. of nuts at $4 a bushel, and sell them at 5 a pint, how much shall I gain? 34. How many ounces in a long ton? |