372 SEC. 11. ASTRONOMY. 



1890. Tellurium and Iiunarium. 



F. Hornung, Langenbeutingen, Wiirtemberg. 



1891. Apparatus intended to elucidate the Apparent Mo- 

 tions of Planets seen from the earth. 



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

 tory at Leyden. 



The apparent motions of a superior planet are depicted on the inner surface 

 of a cylinder. This apparatus was made by Professor Kaiser for his popular 

 lessons on astronomy. 



1892. Apparatus for demonstrating the Path of the Moon 



round the Sun, as an epicycloid, without cusp or loop. 



Dr. K. Oppel. 



When the handle is turned the moon will mark, by means of a pencil to 

 be inserted in the socket under it, its serpentine path on a sheet of paper 

 laid underneath. 



1893. Model of the Paths of the Earth and of Venus, 

 with movable balls' on a stand, for demonstrating the position of 

 the nodes and apses, inclination of the orbit, the period of Venus, 

 culminations, &c. J. J. Oppel. 



1894. Armillary Sphere of brass, to take to pieces, with 

 horizon and azimuth, meridian, equator, ecliptic, declination, and 

 polar circles, movable sun, &c. J. J. Oppel. 



This sphere demonstrates many of the definitions of spherical astronomy : 

 zenith and azimuth culmination, circumpolar stars, longitude and latitude, 

 the seasons, hour-angles, sunrise and sunset according to time and place, 

 length of the day, &c., &c. 



1895. Apparatus for demonstrating (a) Foucault's Pen- 

 dulum Experiment, and (b) the relation between the Period 

 of Revolution of the Pendulum and Geographical Lati- 

 tude. J. J. Oppel. 



The apparatus, placed on a common centrifugal machine and turned 

 slowly to the left, shows the maintenance of the plane of oscillation of the 

 pendulum as respects its apparent revolution for the spectator, a revolution 

 which the ball of the pendulum (painted half black half red) itself does not 

 accomplish. 6. With a movable tangent cone the instrument demonstrates, 

 by means of some large diagrams, that, and why the apparent angular 

 velocity is proportional to the sine of the geographical latitude. 



1896. Apparatus for demonstrating the alteration 

 of the date in journeys round the world, from west to east. 

 Property of His Highness Prince Pless, Furstenstein. 



Committee of Breslau. 

 This instrument dates from the first quarter of the 18th century. 



1897. Siderial Atwood's Machine, with a ball, which 

 represents either the moon or a planet. Chr. Trunk, Eisenach. 



The peculiarity of the apparatus and its object explained in the description 

 which accompanies the model. 



