through or near the middle of the belt. The belts are as follows: Eastern, Central, Mountain, and Pacific.

The standard meridian for the Eastern belt is the 75th, for the Central belt the 90th, for the Mountain belt the 105th, and for the Pacific belt the 120th.

These standard meridians are 15 degrees apart. Therefore, when it is noon in the Eastern belt, it is 11 A.M. in the Central belt, 10 A.M. in the Mountain belt, and 9 A.M. in the Pacific belt.

In going westward into another time belt, the traveller sets his watch back one hour.

In travelling eastward, he sets his watch ahead one hour. When it is noon on the standard meridian of each belt, it is called noon at all places in the belt.

NOTE. Time reckoned by this method is not true solar time, but it secures a uniformity of time which is very desirable.

The time in general use is Railroad or Standard time.

Oral.

5. When it is 5 P.M. Mountain time, what is the time in the Pacific belt?

6. When it is 11 A.M. Pacific time, what is the Central time?

7. In travelling from San Francisco to New York, how many times do I change my watch, and do I set it ahead or back?

8. When it is 4 A.M. at Augusta, Me., what is the standard time at St. Louis?

9. When it is 1 P.M. Mountain time at Denver, what time is it at Washington, D.C.?

10. What is the Pacific time at San Francisco when it is 5 P.M. at Chicago?

Written.

11. The longitude of St. Paul is 93° 4' 55" west, of Philadelphia is 75° 10' west. What is the difference in longitude?

12. The longitude of New York is 74° 3" west, of Paris is 2° 20' 12" east. What is the difference in longitude?

13. New York City is 74° 4" west from London. When it is noon at London, what is the true time at New York?

14. The longitude of Boston is 71° 4' west, and Chicago is 87° 36' west. Chicago is how far due west from Boston, if there are 51.27 miles in one degree at their latitude?

15. A person travelled until his watch was 3 hours too fast. In what direction and how far did he go?

16. What is the difference in standard time between Boston and Chicago?

17. If a person goes from New York to San Francisco, will his watch be too fast or to slow, and how much?

18. The difference in longitude between two places is 17° 54' 55". What is the difference in time?

19. The longitude of San Francisco is 122° 26' 15" west, and that of Cincinnati is 84° 26' west. When it is 9 A.M. at San Francisco, what is the time at Cincinnati ?

20. The longitude of Boston is 71° 3' 30" west, and that of Paris is 2° 20' 12" east. When it is 30 min. past 2 P.M. at Paris, what is the time at Boston?

21. Chicago is 87° 38' west. When it is 27 min. 36 sec. past 11 A.M. at Chicago, it is 10 min. past 12 м. at WashingWhat is the longitude of Washington?

ton.

22. St. Louis is 90° 15' 15" west longitude. A gentleman. arriving there from Boston, 71° 3' 30" west, finds that his watch, which was set at Boston, is not right. What change must he make?

23. Mr. Jones started from Philadelphia, and travelled until his watch was 1 hour 30 min. slow. How many degrees did he travel, and in what direction?

24. When it is 12 o'clock noon at Chicago, what time is it in a place 60° 30′ 30′′ west of Chicago?

25. Two men start from the same place, and travel in the same direction, one going 3 degrees and the other 5 degrees per day. They travel until their difference in time is 4 hours. How many days are they travelling?

26. What is the difference of longitude between two places when their difference of time is 6 hr. 15 min. 12 sec.?

27. The difference in time between two places is 8 hr. What is the difference in longitude?

28. The longitude of New York is 74° 3" west. When it is 6 P.M. at New York it is 49 min. 35 sec. past 11 P.M. at Berlin. What is the longitude of Berlin?

29. The longitude of Philadelphia is 75° 10' west. When it is 10 A.M. at Philadelphia it is 50 min. 55 sec. past 6 A.M. at San Francisco. What is the longitude of San Francisco?

REVIEW OF DENOMINATE NUMBERS.

251. 1. Define a simple number; denominate number; compound number.

2. For what is linear measure used?

3. For what is square measure used? 4. For what is cubic measure used? 5. For what is liquid measure used? 6. For what is dry measure used? 7 For what is Troy weight used? A voirdupois weight? Give the table. weight? Give the table.

8. How many grains in a pound Troy?

9. How many grains in an ounce Troy?

Give tables.

Give the table.

Apothecaries'

Avoirdupois?
Avoirdupois ?

10. What is a long ton, and how is it used?

11. How many days in a common year? a leap year? What is the solar year? Explain leap year. When does the civil day begin and end?

12. What is the use of circular measure? Define circle, circumference, diameter, radius, arc. Give the table. What is the measure of an angle? What is a degree? A quadrant? How do we find circumference? How do we find diameter? What is a right angle?

13. What is a surface? a square? a rectangle? a triangle?

14. Give the rule to find the area of a square; of a rectangle; of a triangle; of a circle.

15. Define solid, rectangular solid, cubé, cylinder. How do we find the volume of a rectangular solid? Of a cylinder?

16. What is reduction? Reduction ascending? Reduction descending?

17. Define a denominate fraction. Give the different kinds of reduction of denominate fractions.

18. How do we add compound numbers? subtract? multiply? divide?

19. Give the common method of finding the difference between dates. How do we find the exact difference?

20. What is longitude? How do we find difference in longitude between two places on the same side of a prime meridian? On opposite sides?

21. How do we find difference in longitude when difference of time is given? How do we find difference of time when difference in longitude is given?

22. What is standard time? What are the names of the four time belts? In passing west into a time belt, how does the traveller set his watch? In travelling east?

23. How do we find length when area and breadth are given?

24. How do we find length when volume, thickness, and width are given?

25. What are the dimensions of a rectangular solid?

26. Define cancellation, even number, odd number, prime number, composite number.

27. When are numbers prime to each other?

28. How many cubic feet in a cord of wood or stone? How long, wide, and high is a cord of wood? What is a cord foot?

29. For what is board measure used? What is a board foot? Give the rule for finding board feet.

30. How do we find the capacity of bins? Of cisterns?