114 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



Fi-. 12 1. 



rod, terminated by a brass ball to represent the sun. On 

 this rod are several rings, each bearing a long wire, turned 

 up near the end. These have balls of various sizes at their 

 points, representing the planets of our system, with such 

 moons as naturally belong to them. The length of the 

 wires and size of the balls cannot be made accordant with 

 the real size of the planets and their orbits, on account of 

 the very great extent of space which would be required. 

 The planets are seen in their natural order of Mercury, 

 Venus, the Earth and moon, Mars, Jupiter and four moons, 

 and Saturn with seven moons. Herschel is for want of space 

 omitted. Price, $5.00. 



The Tellurium. The sun, the earth, and the moon, are 

 bodies, which, from our connexion with them, are so inter- 

 esting to us that the annexed instrument has been contrived 

 expressly for their elucidation. This instrument (Fig. 125) 



Fig. 125. 



