Jump to content

Page:A New and Improved System of Mnemonics (Jackson).djvu/33

From Wikisource
This page has been proofread, but needs to be validated.

27

CHAP VI.

GEOGRAPHY.

This most important science, as far as respects the relative situation of places, is easily attained by our method. One may carry a Map of the World in the mind's eye: let us then apply the principles of our art to this branch of education. We have no longer need to burthen our memories with long lists of the Latitude and Longitude of places; our symbols will at once direct us where and in what degrees there is the greatest extent of land or water, or what quarter most abounds with islands, lakes, rivers, &c. We shall limit ourselves to General Geography.—The pupil can easily apply these instructions to particular Maps, by taking a symbol to degree, instead of 1 for 10, as is here done:—Procure a Mercator's Chart, but be careful that the degrees of latitude are marked by tens. Cut it longitudinally into halves; if an English Map, at the meridian of London. Again cut it through the Equinoctial Line. You have it now in quarters; by again dividing it at the 90th degrees East and West longitude, you have it in half quarters.

80
70
60
50
40
30
20
10
80
70
60
50
40
30
20
10
102030405060708090

Long. East.