428 SEC. 11. ASTRONOMY". 



1882. Orrery, lighted with gas, for the demonstration of 

 eclipses, and, by the aid of a "sablier," tracing the real orbit of the 

 moon. Ernest Recordon, Geneva. 



This apparatus shows: 



1. By means of a jet of gas behind globes, representing the celestial 



bodies, a sufficient shadow is cast to give a clear idea of eclipses and 

 the phases of the moon. 



2. The orbits of Venus, the Earth, and Mars. 

 8. The difference in length of planetary years. 



4. The diurnal rotation of the Earth. 



5. The two classes of planets; the inferior represented by Venus, the 



superior by Mars. 



6. The phases of the moon. Demonstration effected by means of a gas 



flame. 



7. The real orbit of the moon. By means of a special contrivance, an 



epicycloidal line of fine sand is traced, which perfectly represents the 

 lunar orbit. 



1882b. Orrery. The Earl of Cork,, K.P. 



1884b. Azimuthal Planisphere. 



Le Vicomte Duprat, Consul- General of Portugal. 



1883. Selenographia, for showing all the effects of libratiou, 

 rotation, and elongation on the surface of the moon. 



John S. Marratt. 



This instrument, the invention of Mr. John Russell, illustrates the various 

 Lunar phenomena, the libration in latitude and polar obliquity, the libration 

 in longitude, the mean state of libration, diurnal and monthly, the periodical 

 and synodical revolutions, and how to determine the position of polar axis, 

 &c. 



1884a. Planisphere, with glass globe. A. Herbst, Berlin. 



1885. Model of the Solar System, made by Professor 

 Kaiser for his popular lessons on astronomy. The orbits of the 

 planets from Mercury to Jupiter are represented in their relative 

 dimensions. 



H. G. Van de Sande Bakhuyzen, Director of the Observa- 

 tory, Leyden. 



1885a. Cosmographic Clock, reproducing all the astrono- 

 mical phases of our globe, in relation to the sun. 



M. Mouret, Paris. 

 1888* Planetarium, with clockwork. Ernst Schotte, Berlin. 



1889. Tellurium and Lunarium, with clockwork. 



Ernst Schotte, Berlin. 



1890. Tellurium and Lunarium. 



F. Hornung, Langenbeutingen, Wiirtemberg. 



