GLOBES AND SETS OF SCHOOL APPARATUS, 



MANUFACTURED AND SOLD 



BY BENJAMIN PIKE, JR., 



294 BROADWAY, NEW YORK. 



THE artificial globe is a round body or 

 sphere, having on its surface a map of the 

 earth, or of the celestial constellations, as 

 delineated, with the principal circles of the 

 sphere. In the former case it is called the 

 terrestrial, in the latter the celestial globe. 

 Artificial globes are used for the purpose of 

 conveying to young persons the first ideas 

 of the figure and rotation of the earth, of lat- 

 itude and longitude, and the situation of 

 places with respect to each other, and to the 

 sun at different seasons of the year. It is 

 usual to employ them also for the purpose 

 of solving mechanically elementary problems 

 of astronomy, relative to tlie difference of the 

 hour of the day at different places, the times 

 of the rising and setting of the sun, the limits 

 of the visibility of eclipses, &c. 



The fundamental parts of these instru- 

 ments, which are common to both, are, first, 

 the two poles whereon the globe is support- 

 ed, representing those of the world ; second, 

 the brazen meridian, which is divided into 

 degrees, and passes through the poles ; third, 

 the wooden horizon, whose upper side repre- 

 sents the real horizon, and is divi- 

 ded into several circles ; fourth, a 

 brass quadrant of altitude ; fifth, 

 two hour circles, one moving round 

 each pole as a centre, and divided 

 into twice twelve hours, to indicate 

 those of the day and night. Upon 

 the surface of the globes are de- 

 picted the lines of latitude and 

 longitude, the equator, ecliptic, 

 tropics, and polar circles. On one 

 globe, in addition to these, are the 

 various countries, seas, &c., of the 

 world ; and on the other, the stars 

 in their relative positions. 



Terrestrial and Celestial Globes, 

 9, 12, 18, and 36 inches diameter, 

 made by MALBY & SON, London, 



