374 SEC. 11. ASTRONOMY. 



ongitude of the stars ; B the difference of the sidereal and tropical year ; 

 C the change of the pole star. The long wire at a can be fixed either in 

 the direction of the pole (for A) or of the earth's axis (for C). The plane of 

 the ecliptic is supposed horizontal ; the appliance a must be turned to the 

 right slowly on its pivot. 



1906. (1.) Diagram for Nautical Astronomy, engraved on 



stone ; with a printed explanation. (2.) Diagram of Nautical 

 Astronomy. Handbook of Practical Nautical Astronomy. 



1907. Orrery, by Cole : explanatory of eclipses. 



Royal Society. 



1908. Celestial Globe. 



Dietrich Reimer, Berlin (Reimer and Hoefer). 



1909. Celestial Globe of 80 cm. diameter, with complete 

 equipment. Dietrich Reimer, Berlin (Reimer and Hoefer). 



X. ASTRONOMICAL DRAWINGS. 



1910. Unfinished Chalk Drawings of Lunar Craters, made 

 with the reflector of 3 feet aperture, at Parsonstown, by Mr. Samuel 

 Hunter, assistant in. 1860 to 1864. Earl of Rosse, F.R.S. 



191Oa. Chart of the Moon, drawn by hand by Tobias Meyer. 



Prof. Dr. JVinnecke, Strassburg. 



The highly interesting chart of the moon is the original drawing by Tobias 

 Meyer, executed in the year 1750, which served for more than half a century 

 as copy for all the maps of the moon used in nearly all the text -books. 

 The autograph remarks on it, by the well-known Professor Ticktenberg, of 

 Gottingen, show how and where the chart was preserved during the last 

 century. It came into the possession of the exhibitor by a legacy of the late 

 Privy Councillor Eisenlohr, of Carlsruhe. 



1910b. Landscape of the Moon in relief, by Witte. 



Prof. Dr. Winnecke, Strassburg, 



This view of the moon was executed by the celebrated Lady Frau Hofrath 

 Witte, in Hanover, after her own observations. After her death it was pre- 

 sented to the exhibitor by her daughter Frau Stadtrath von Madler. 



191Oc. A Series of Astronomical Engravings, from the 

 Observatory of Harvard College. J. Norman Lockyer, F.R.S. 



MODELS, &c. OF ASTRONOMICAL INSTRUMENTS. 



1911. Model of one of the three Smaller Domes for the new 



Imperial Observatory at Vienna, now in course of construction at 

 Mr. Howard Grubb's Works, Rathmines, Dublin. Scale, 1 inch 

 to a foot. Howard Grubb, F.R.A.S., Dublin. 



This dome is supplied with Mr. Grubb's improved shutter, by means of 

 which, being perfectly balanced in all positions, the shutters of dome roofs 

 are as easily managed as those of drum roofs. 



