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



Fig. 739. 



French Movable Sliders (Fig. 739) Representing comic, 

 grotesque, and ludicrous views, the movements set in brass 

 mounting. Price, each, $2.00. 



Astronomical Sliders. (Fig. 740.) These are most usu- 

 ally in sets, embracing eleven sliders, three of which are 

 movable ; one representing the rotundity of the earth ; one 

 the eclipse of the sun, with the transit of Venus ; and the 



Fig. 740. 



other the eclipse of the moon. There are thirty-two views 

 in this set, embracing the most important diagrams, with 

 book, describing each slider in the form of an astronomical 

 lecture. Price of large size, in case, $20.00. 



" 12-inch long, - $15.00. 

 8-inch " - $7.50. . 



Movable Astronomical Diagrams. The motions produced 

 by rack- work in a set of nine sliders. 



Slider 1. The solar system, showing the revolution of all 

 the planets, with the satellites, round the sun. 



Price, $5.75. 



Slider 2. The earth's annual motion round the sun, show- 

 ing the parallelism of its axis, thus producing the seasons. 



Price, $5.00. 



Slider 3. This diagram illustrates the cause of spring and 

 neap tides, and shows the moon's phases, during its revolu- 

 tion. Price, $4.25. 



Slider 4. This diagram illustrates the apparent direct and 

 retrograde motion of Venus or Mercury, and also its station- 

 ary appearance. Price, $4.00. 



