50 MOVABLE ASTRONOMICAL DIAGRAMS. 



MOVABLE ASTRONOMICAL DIAGRAMS, 



THE MOTION PRODUCED BY RACK-WORK. 

 No. 



1107 No. 1, the solar system, showing the revo- 



lution of all the planets with their satel- 

 lites round the sun, - - - $ 5.75 



1108 No. 2, the earth's annual motion round the 



sun, showing the parallelism of its axis, 



thereby producing the seasons, 5.00 



1109 No. 3, this diagram illustrates the cause of 



spring and neap tides, and shows the moon's 



phases, during its revolution, - 4.25 



1110 No. 4, this diagram illustrates the apparent 



direct and retrograde motion of Venus or 

 Mercury, and also its stationary appearance, 4.00 



1111 No. 5, a diagram to prove the earth's rotun- 



dity, - - 3.75 



1112 No. 6, this diagram illustrates the eccentric 



revolution of a comet round the sun, and 

 shows the appearance of its tail at different 

 points of its orbit, ... 5.25 



1113 No. 7, The diurnal motion of the earth, 



showing the rising and setting of the sun, 

 illustrating the cause of day and night, by 

 the earth's rotation upon its own axis. - 4.00 



1114 No. 8, this diagram illustrates the annual 



motion of the earth round the sun, with 



the monthly lunations of the moon. 5.75 



1115 No. 9, this diagram shows the various eclips- 



es of the sun with the transit of Venus, 4.00 



1116 Or the whole set in a box with lock and key, 38.00 



1117 Constellations in six sliders; their situation 



with regard to the north pole is denoted by 

 an arrow. 



Slider No. 1. 1, Aries ; 2, Taurus ; 3, Ge- 

 mini; 4, Cancer. 



Slider No. 2. 5, Leo ; 6, Virgo ; 7, Libra ; 

 8, Scorpio. 



