268 Description and TJse of the

There is another broad meridian passingthrough the Pacific sea, at the JXth hourupon the equator, and the Hid hour uponeach polar circle; this contains only onequadrant, or 90 degrees, the numbers an-nexed to it begin at the northern polarcircle, and end at the tropic of Capricorn.

Here we must likewise observe, thereare 23 concentric circles drawn upon theterrestrial globe within the northern andsouthern polar circles, which for the futurewe shall call polar parallels; they are placedat the distance of one degree from eachother, and represent the parallels of thefun’s declination, but in a different mannerfrom the 47 parallels between the tropics.

The following problems require the globeto be placed upon a plane that is level, ortruly horizontal, which is easily attained,if the floor, pavement, gravel-walk in thegarden, &c. should not happen to be ho-rizontal.

A flat seasoned board, or any box whichis about two feet broad, or two feet square,if the top be perfectly flat, will answer thepurpose, the upper surface of either maybe set truly horizontal, by the help of a