THE USE OF THE TERRESTRIAL GLOBE. 293 



globes, the horizon is the first part that fails, on account LECT. 

 of its having been made too slight. 



In using the globes, keep the east side of the horizon Direct i ons 

 towards you (unless your problem requires the turning for using 

 of it) which side you may know by the word East upon 

 the horizon ; for then you have the graduated side of 

 the meridian towards you, the quadrant of altitude be- 

 fore you, and the globe divided exactly into two equal 

 parts, by the graduated side of the meridian. 



In working some problems, it will be necessary to 

 turn the whole globe and horizon about, that you may 

 look on the west side thereof; which turning will be apt 

 to jog the ball so, as to shift away that degree of the 

 globe which was before set to the horizon or meridian : 

 to avoid which inconvenience, you may thrust in the 

 feather-end of a quill between the ball of the globe and 

 the brazen meridian ; which, without hurting the ball, 

 will keep it from turning in the meridian, whilst you 

 turn the west side of the horizon towards you. 



PROBLEM I. 



To jind the latitude and longitude" of any given place 

 upon the globe. 



Turn the globe on its axis, until the given place 

 comes exactly under that graduated side of the brazen 



N<>te 76. The latitude of a place is its distance from the equator, 

 and is north or south, as the place is north or south of the equator. 

 Those who live at the equator have no latitude, because it is there 

 that the latitude begins. Note by the Author. 



Note 77. The longitude of a place is the number of degrees (reck- 

 oned upon the equator) that the meridian of the said place is distant 

 from the meridian of any other place from which we reckon, either 

 eastward or westward, for 180 degrees, or half round the globe. The 

 English reckon the longitude from the meridian of London, and the 

 French now reckon it from the meridian of Paris. The meridian of 

 that place, from which the longitude is reckoned, is called the first 

 meridian. The places upon this meridian have no longitude, because it 

 is there that the longitude begins. Ibid. 



