432 SEC. 11. ASTRONOMY. 



19 1O. 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 



1910a. Chart of the Moon, drawn by hand by Tobias Mayer. 



Prof. Dr. Winnecke, Strassburg. 



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

 Mayer, 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 Lichtenberg, 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, from her own observations. After her death it was pre- 

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



1910c. 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. 



This is accomplished by a set of counterpoises, equal in the aggregate to 

 the whole weight of the shutter, which are lowered one after another into the 

 place prepared for them. When the shutter is half open all the weights are 

 deposited, the shutter being then balanced in itself. The chains then lap 

 round a roller prepared for them, and as the shutter opens still further the 

 weights are again raised up one by one as the shutter gets heavier and 

 heavier towards the back. 



If desired, this form of roof can also be made to open beyond the zenith by 

 placing a pair of doors at the base of the shutter " chase," which open auto- 

 matically, and allow the shutter to roll back. 



1912a. 11 Photographs of the buildings of the Observatory 

 and its principal instruments. The Pulkowa Observatory. 



1912b. 1O Photographs of several auxiliary instruments 

 lately constructed by M. Herbst, at the mechanical workshop 

 of the Observatory. The Pulkowa Observatory. 



1912c. Photographs of Mr. NewalPs Observatory. 



J. Norman Lockyer, F.R.S. 



1914c. Two Photographs of the 25-inch Refractor con- 

 structed by Messrs. Cooke & Sons, of York, for Mr. Newall, of 

 Gateshead-on-Tyne. J. Norman Lockyer, F.R.S. 



